catalyst: (top of page 72) what are the four main components in your blood?
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Catalyst: (Top of page 72) What are the four main components in your blood? . Agenda Catalyst Quiz and MELCon return Blood Handout Objective Identify the different components of blood . Unit 2 - Homeostasis . Homeostasis . Homeo - means similar Stasis- means balance - PowerPoint PPT PresentationTRANSCRIPT
Catalyst: (Top of page 72) What are the four main
components in your blood? Agenda Catalyst Quiz and MELCon return Blood Handout Objective Identify the different components of
blood
Unit 2 - Homeostasis
Homeostasis Homeo- means similar Stasis- means balance Homeostasis – Is the internal balance maintained by an organism
Homeostasis Each cell is responsible for
maintaining internal balance. What types of things does your
body need to keep in balance? Hydration (water), Blood Sugar,
salts, temperature, pH…..to name just a few
Homeostasis The nutrients you absorb through
your food have to get distributed throughout your body
How can the cells on the top of my head maintain the same homeostasis as the cells on the bottom of my feet?
Your body is a connected system with BLOOD being at the center of it all
Blood- how much How much blood do you have in your
body? It depends on your size A 150lb man has ~8pints (5.2L) A 110lb woman has ~5 pints (3.3L) Average woman has 6-7 pints (4-4.5L)Average man has over 7 pints ( 4.5-
5.5L)
Catalyst: Where is blood made in your
body? AgendaCatalyst
Components of blood
Types of blood vessels
Capillaries
Objective Identify the four components of blood and their functions Identify the three types of blood vessels and how they
distribute blood throughout your body
Blood- How is it made?
Blood is made in your bones…What? I thought bones were solid?
How can they make a liquid? In the Bone Marrow
Bone Marrow Transplants
• People with blood disorders and cancers of the blood like leukemia will often need bone marrow transplants.
Blood- What’s in it? Red blood cells White blood cells Platelets Plasma
Catalyst: If blood is made in your bone marrow
what does your heart do? Reminders: Lab reports are due to me by 3:45pm or
they are LATE. Please email me [email protected] your report if you are unable to print it (emergencies ONLY).
Please start bringing your book to class every day.
AgendaCatalyst & RemindersBlood Vessels Heart Making Exchanges in the body Objectives: Identify the three types of blood vessels Identify the path blood takes throughout the human
body
Blood Videos
http://www.kidport.com/reflib/science/humanbody/cardiovascular/Video/CapillaryVideo.htm
Types of blood vessels
______________- large blood vessels that carry oxygen rich blood from the heart & lungs throughout the body
______________- small blood vessels that allow for the diffusion of molecules from the blood into cells. (molecules like Oxygen, salts, sugars and small proteins)
______________- larger blood vessels that carry blood and cell waste products back to the heart and lungs.
How blood vessels connect
Capillaries Why would blood slow down when it enters a capillary?
(find 2 reasons) Red blood cells go through capillaries SINGLE FILE Capillaries are ONE CELL LAYER THICK Capillaries facilitate the exchange of wastes, nutrients,
gases and hormones between the blood and body cells. Change in pressure between the capillary and the
tissue allow for diffusion Capillaries are so small and so abundant that cells are
never more than 1/4000 of an inch from a capillary. (less than the thickness of your finger nail.
The Heart If blood is made in bone
marrow then what does your heart do?
About the size of your fist
Is a large muscle that pumps the blood around your body.
Beats ~100,000/day ~ 35,000,000/year
Has four chambers
http://www.youtube.com/watch?v=RzscxSavKp8
When the heart contracts it creates pressure that moves your blood
Catalyst: What types of molecules get exchanged between the blood and
your lungs? Agenda
Homework review
Types of exchanges
The Breath of Life
Objectives: SWBAT Identify the three main types of blood vessels Describe the types of molecular exchanges that
happen between the blood and body tissues.
Pop Quiz (you can use your notes)
Use the following words to fill in the sentences : diffusion, Carbon dioxide,
oxygen, veins, capillaries, arteries, wastes.
__________- rich blood comes from the lungs and goes into the left side of the heart.
Blood gets carried away from your heart by ______________. (___________= away)
From there blood goes into the smallest blood vessels called_______________ .
__________________of oxygen and other nutrients takes place in the capillaries.
After that the cells diffuse _____________like _________________ and it gets picked up by the red blood cell.
Blood travels back toward the heart in __________________. The whole process repeats
Oxygen
Arteries Arteries
Capillaries
Diffusion
Wastes Carbon dioxide
Veins
Tracing the Blood Pg. 226
The blood starts in the capillaries of the toe.
The red blood cell moves into a vein up the left leg, that brings it back to the heart and lungs.
Enters the right side of the heart gets pumped into the lungs
The blood enters the left side of the heart and gets pumped out into an artery.
It travels in an artery down the right leg.
The artery branches into smaller capillaries that bring the red blood cell to the other toe.
Catalyst: (NB pg. 74 What types of exchange are
made between the blood and the kidneys? Agenda
Catalyst Making exchangesGas exchange system Objectives: SWBAT Explain how diffusion is used to exchange oxygen
and CO 2 in the gas exchange system.
Making Exchanges Pg. 224-226 & pg
166 Tissues of the toe
Tissues of the kidneys
Tissues of the lungs
Tissues of the intestines
Tissues of the Liver
Types of exchanges with the blood
Red Blood Cells diffuse oxygen into tissues
Toe cells diffuse CO2 into red blood cell
Red blood cells collect oxygen in lungs and release CO2 that was collected from cells throughout the body
Kidneys filter out excess water, salts and Nitrogen based wastes (urea) from blood
Intestine tissues release, sugar, salts, fats and proteins into the blood
Liver filters out toxins from the blood like alcohol and other harmful chemicals
Gas Exchange System
(Respiratory System) http://www.youtube.com/watch?v=hc1YtXc_84A
Your lungs
Alveoli
Asthma
Smoking causes PERMINENT damage to Alveoli
Breath of life Pg. 236-239 Please READ silently Take NOTES (notebook pg. 75) ANSWER QUESTIONS 1- 8 (notebook pg. 78)
Catalyst: What is the role of the alveoli in gas exchange?
Please draw the following image into your notes:
Agenda
Catalyst
Homework review
Stepping up the Pace lab
HW: Answer questions 8-12 from lab sheet
Objectives SWBAT Follow simple experimental procedures Collect and record data to examine how the
cardiovascular system responds to environmental changes
The Breath of Life Homework Review
1. The gas exchange system; nose, mouth, trachea, bronchi, lungs and diaphram.
2. Nosetracheavocal cordsbronchial tubeslungs alveoli 3. alveoli 4. Increases the amount of oxygen that can move into the body’s internal
environment and the carbon dioxide that can move out.5. The oxygen diffuses across the alveolar membranes 6. Hemoglobin is a special protein that is found on a red blood cell. It
allows Oxygen (O2) from the atmosphere to bond to the red blood cell.
7. When you exercise your cells release more carbon dioxide. Blood becomes acidic in the presence of carbon dioxide. Nerves react to the increased acidity and send a message to the respiratory centers to increase your breathing rate.
Catalyst: What is the control group for the
‘stepping up the pace’ experiment? Agenda
Catalyst
HW Review
Lab
ObjectivesFollow simple experimental procedures Collect and record data to examine how the
cardiovascular system responds to environmental changes
Stepping up the Pace Lab Questions 8-12
Homework Review 8. What is the most appropriate independent variable for this experiment? (what are we changing from tril to trial?)D-Intensity of exercise 9. What is the most appropriate dependent variable for this experiment? (what are we measuring?) A- Heart rate (pulse) 10. What would be the most appropriate hypothesis for this experiment? (If…independent variable…then…dependent variable) D- If a person exercises with increasing intensity, then their heart rate will increase and will take longer to return to normal.
11. What is the most appropriate control for this experiment? (what is the ‘normal condition’ we can use to compare?) A- Participants resting pulse rate 12. What are the controlled variables that would need to stay constant during the experiment? (circle all that apply) a. Time spent exercising b. Intensity of exercise c. height of step
Stepping up the Pace Lab Questions 8-12
Homework Review
Stepping Up the Pace Lab
Find 3 desks to brace against a lab table for the step-ups All three participants exercise at the SAME TIME Research director is responsible for calling out when to step (YOU
WILL HAVE TO BE ABLE TO COUNT BY 6’S AND 3’S FOR ONE MIN)
After exercise, participants NEVER STOP taking their pulse!
Write down your pulse every min!
Exercise Number Exercise Intensity
Exercise 1
One step (up and down) every 6 sec for 1 min
Exercise 2
One step (up and down) every 3 sec for 1 min
Exercise 3
One step (up and down) every 1 sec for 1 min
Catalyst: What is the role of the alveoli in gas exchange?
Please draw the following image into your notes:
Catalyst: What do you expect to happen to a persons pulse and
respiratory rate when they exercise? Agenda
Catalyst
Pre-Lab
Stepping Up the Pace Lab
ObjectivesFollow simple experimental procedures Collect and record data to examine how the
cardiovascular system responds to environmental changes
Breath of Life Questions Revisited Homework
Review 1. The gas exchange system; nose, mouth, trachea, bronchi, lungs and
diaphram. 2. Nosetracheavocal cordsbronchial tubeslungs alveoli 3. alveoli 4. Increases the amount of oxygen that can move into the body’s internal
environment and the carbon dioxide that can move out.5. The oxygen diffuses across the alveolar membranes 6. Hemoglobin is a special protein that is found on a red blood cell. It
allows Oxygen (O2) from the atmosphere to bond to the red blood cell.
7. When you exercise your cells release more carbon dioxide. Blood becomes acidic in the presence of carbon dioxide. Nerves react to the increased acidity and send a message to the respiratory centers to increase your breathing rate.
Stepping Up the Pace Lab
Find 3 desks to brace against a lab table for the step-ups All three participants exercise at the SAME TIME Research director is responsible for calling out when to step (YOU
WILL HAVE TO BE ABLE TO COUNT BY 6’S AND 3’S FOR ONE MIN)
After exercise, participants NEVER STOP taking their pulse!
Write down your pulse every min!
Exercise Number Exercise Intensity
Exercise 1
One step (up and down) every 6 sec for 1 min
Exercise 2
One step (up and down) every 3 sec for 1 min
Exercise 3
One step (up and down) every 1 sec for 1 min
Homework
Answer questions 8-12 on your lab sheet
Agenda
Catalyst
Homework Review
Graphing & Analysis
Objective SWBAT Graph and analyze data from the ‘Stepping Up
the Pace Lab”Write a conclusion using data based evidence.
Catalyst: What is Homeostasis? How was your
body maintaining homeostasis in the lab?
If you do NOT have data Use mine…
Person
Exercise
Resting Pulse
Immediately after
1 min 2min 3min 4min 5min
Richter 1 88 133 115 90 87 872 87 135 110 95 88 883 88 130 108 90 87 86
Adams 1 65 118 100 80 70 652 65 120 108 90 653 65 125 98 80 65
Malinkovich
1 72 100 80 73
2 73 110 78 733 73 110 81 73
Analysis 1. Explain the purpose behind increasing the intensity of the
exercise between trials. 2. Which participant had the largest increase in pulse rate
during exercise 3? (IOD 501) 3. Which participant had the longest recovery time after
exercise 3? (IOD 501) 4. Which participant had the greatest difference between
their resting pulse rate and their maximum pulse rate? (IOD 401)
5. Which participant had the smallest difference between their resting pulse and their maximum pulse rate after exercising? (IOD401)
Conclusion Main Idea -
Restate your hypothesis. Did you support or reject your hypothesis?
Evidence- Use three pieces of evidence/data (exercise #, participant name,
(#)pulse rate, unit) to support your claims from the M- section above Link-
Explain your data in terms of how the circulatory and respiratory system work together to maintain homeostasis.
Conclusion- Discuss how body systems work together to maintain homeostasis
when affected by stimuli from the environment.
Homework
Read “Homeostasis” pg. 229-231
Answer questions 1-7 in your NOTEBOOK
Catalyst: What is Homeostasis? How was your
body maintaining homeostasis in the lab?
Agenda
Catalyst
Homeostasis reading
Review and reflect
Objectives SWBATWrite a conclusion based on data evidence. Explain how homeostasis is maintained by body
systems.
Connecting the lab to Homeostasis…
With your lab groupRead “Homeostasis” pg. 229-231
Answer questions 1-7 in your NOTEBOOK
Homeostasis Review1. What is homeostasis?2. How do complex organisms maintain homeostasis? 3. How do simple organisms maintain homeostasis?4. What are two things required to maintain homeostasis?5. What is stimulus? (plural = stimuli) 6. How does the body respond to stimulus, such as cold
temperature? 7. What are homeostasis and stimuli and why are they
important?
ConclusionsTake a moment to think about what was
just discussed & review the last section of your conclusion from your lab.
The prompt asked you too: Discuss how body systems work together to maintain homeostasis when affected by stimuli from the environment.
Add 3-4 sentences that show your enhanced understanding after reading and discussing stimuli.
pg. 233-235Define: Feed Back SystemPositive Feedback Systems
Find an example from the textNegative Feedback Systems
Find an example from the text
Breath of Life recap…
7. Describe the feedback system that is involved in increasing your breathing rate when you’re exercising. When you exercise your cells release more carbon dioxide. Blood becomes acidic in the presence of carbon dioxide. Nerves react to the increased acidity and send a message to the respiratory centers to increase your breathing rate.
Catalysts: (next open page) What will happen to you if your homeostasis is thrown out of balance?
AgendaCatalystFeedback systems
Objectives SWBAT • Identify negative feedback systems • Use an example a negative feedback system
in the human body
Principles of Homeostasis & Feedback Mechanisms
... THE MAINTENANCE OF STATIC OR CONSTANT CONDITIONS IN THE
INTERNAL ENVIRONMENT ...
External Environment
External Environment
External Environment
External Environment
Internal Environment
External Environment
External Environment
External Environment
External Environment
Internal Environment
Homeostasis is about staying the same ... but ... things don’t stay the same ... They
CHANGE!Conditions in the external environment change constantly ...
Internal Environment CANNOT change!
Homeostasis is about staying alive!
•For proper functioning , the the fluids around the cells (“interstitial fluid”) must remain close to their best (optimal) conditions.
•An organism is in homeostasis when the internal environment has the optimal concentration of:
GasesNutrientsIons & waterTemperatureIs not invaded by pathogens (anything that can make you sick.
Viruses, bacteria, etc…)
Maintaining HomeostasisOrgan systems work together to maintain homeostasis through:• hormonal and nervous mechanisms• The nervous system is the bodies ‘master control system’
As previously stated…..The body must • protect itself against pathogens• regulate respiratory gases • maintain fluid and salt balance • regulate energy and nutrient supply • maintain a constant body temperature
• All these must be coordinated and appropriate responses made to incoming stimuli.
Homeostasis operates by means of control systems
• Sensory Receptors (eye, ear, nerves pick up signals)
• Control Center (brain)
• Effectors (what responds)
Homeostasis is characterized by Negative Feedback
1. Response is negative (opposite) to the beginning stimulus
2. The control system starts a series of changes that return the factor toward the optimal value
3. Thus maintaining homeostasis.
• Oxygen must be delivered to all cells and carbon dioxide (a waste product of cellular respiration) must be removed.
• Breathing (inhalation and exhalation) brings in oxygen and expels CO2.
• The rate of breathing is varied according to the oxygen requirement.
• Both gases are transported around the body in the blood; the oxygen mostly bound to hemoglobin.
• All of us are under constant attack from pathogens (disease causing organisms).
• The body has a number of mechanisms that help to prevent the entry of pathogens and limit the damage they cause if they do enter the body.
• The skin, the digestive system and the immune system are all involved in limiting damage.
• Food and drink must be taken in to maintain the body's energy supplies.
• Steady levels of energy (as glucose) is available to cells through hormonal regulation of blood sugar levels.
• Insulin, released by the endocrine cells of the pancreas, causes cells to take up glucose after a meal.
• Glucagon causes the release of glucose from the liver.
• Damage to body tissues triggers the inflammatory response.
• There is pain, swelling, redness, and heat. Phagocytes and other white blood cells move to the injury site.
• The inflammatory response is started (and ended) by chemical signals (e.g. from histamine and prostaglandins) released when tissue is damaged.
• The levels of water and ions in the body are maintained mainly by the kidneys, although the skin is also important.
• Osmo-receptors monitor the fluid and ion levels of the blood and bring about the release of regulatory hormones.
• the kidneys regulate reabsorption of water and sodium from blood in response to levels of the hormones ADH and aldosterone.
• The body is constantly bombarded by stimuli from the environment. The brain sorts these stimuli into those that require a response and those that do not. Responses are coordinated via nervous or hormonal controls.
• Simple nervous responses (reflexes) act quickly.
• Hormonal responses take longer to produce a response and the response is more prolonged.
Exit ticket!
• Use an example to explain how negative feedback helps your body to maintain homeostasis!
• Homework pg. 233-235 • Define: • Feed Back System• Positive Feedback Systems
• Find an example from the text• Negative Feedback Systems
• Find an example from the text
• A system exhibiting positive feedback, in response to stimulus, acts to increase the magnitude of the stimulus. That is, "A produces more of B which in turn produces more of A". A vicious cycle!
• In contrast, a system that responds to a stimulus in a way that reduces its effect is said to exhibit negative feedback.
Positive Feedback Systems
Alarm or panic can spread by positive feedback among a herd of animals to cause a stampede
Positive feedback in action• When you get a cut your body
immediately sends a message to send more blood platelets to the area• The body keeps sending the
message until the area is flooded with platelets • A clot forms • The bleeding stops
0 hours 1 hour 2 hours 3 hours 4 hours0
1
2
3
4
5
6Positive FeedbackNegative FeedbackThe
normal heart pumps about 5 L of blood/min
Volumeof blood
(L)
• With the withdrawal of 2L of blood the heart becomes progressively less effective in terms of its pumping effectiveness.
• This leads to less blood being delivered to tissues which in turn further weakens the heart making it even less able to effectively pump ... A vicious cycle or positive feedback that without intervention quickly leads to eternity.
Note that with only 1L of blood loss the heart is capable of returning (via negative feedback) to normal function.
On a ½ sheet of paper (will get turned in! ... Make your own story1. Identify the stimulus (cause) 2. Create a story that demonstrates
positive feedback 3. Create a story that demonstrates
negative feedback system.
Exit Ticket Or Homework!
Catalyst: What is negative feedback?
Agenda
Catalyst
Finish feedback loops
Skills Practice with Homeostasis
Lab report return
ObjectiveUse an example to define negative and positive feed
back loops Practice college readiness standards focused around
experiments that investigate homeostasis.
pg. 233-236Define: Feed Back SystemPositive Feedback Systems
Find an example from the textNegative Feedback Systems
Find an example from the text
Catalyst: Think of the lab from last week. Why would you measure a persons
respiratory and pulse rate before they exercise?
Agenda
Catalyst
Review for test on WEDNESDAY!
Objectives SWBAT Explain how the cardiovascular system uses
diffusion to help maintain homeostasis.
Skills worksheet (3rd period only)
Homework review Q1- rates were measured so that a baseline
could be established and a control used to allow for data to be compared.
Combine the data onto one graph Rate of exercise- day 1 slow exercise, day 2
fast exercise. The resting pulse and respiratory rate of the
participants Type of machine used for the exercise (tredmill
vs. cycle)