the circulatory system the heart. vocabulary woo-hoo! 1.myocardium 2.atrium 3.ventricle 4.valve...
TRANSCRIPT
Vocabulary Woo-Hoo!
1. Myocardium2. Atrium3. Ventricle4. Valve5. Aorta6. Artery7. Capillary8. Vein
What Factors Affect Heart Rate?
• Make a list of things that might affect how fast your heart beats…• Can we test any of them right now?• Mini-Lab• Write the Question:_________________________________________• Write a Hypothesis: _________________________________________• Experiment!• Record Data• Results-Make a graph• Conclusion-what happened? Were you right?
The Circulatory System
The human circulatory system consists of the heart, blood vessels,
and blood.
The Heart
• Your heart is about the size of your fist and is slightly to the left of your sternum.• It is made of mostly muscle• The heart is enclosed in a sac of tissue called the pericardium• The myocardium is a thick layer of muscle that causes the heart to
pump.• The heart pumps on average 72 times per minute• During one year the average person pumps enough blood to fill an
Olympic size swimming pool!
Left Atrium—the upper chamber, receives blood
from the lungs and pumps it into the lower chamber.
Left Ventricle—receives blood from atrium above it,
pumps oxygen rich blood into the Aorta and out to the
body.
Right Atrium—receives deoxygenated blood from
the body
Right Ventricle– receives blood from atrium above and pumps blood to the
lungs through the pulmonary artery
Valves—like gateways from one chamber to another or the
ventricles to the arteries, the valves keep blood from going
backwards. Valves keep blood flowing in the right direction.
Color and Label the Heart Diagram
Pulmonary VeinsLeft Atrium
Left VentricleAortic ValveMitral Valve
AortaRight Atrium
Right VentriclePulmonary Artery
Superior Vena CavaInferior Vena Cava
How the Heart Works Animation Video• 5 facts!!
Your Heartbeat
•When the muscle fibers in your atria and ventricles are stimulated (by the Sinoatrial node), the atrial muscles contract followed by the ventricle muscles (the 2 step pattern = lub dub rhythm)•Your heart will beat faster or slower depending on your body’s need for exercise (more oxygen=faster and more beats per min)
Blood VesselsAs blood flows through the circulatory system it moves through three types of blood vessels—arteries, capillaries, and veins
Arte
ries Large vessels that carry
blood from the heart to tissues of the body supplying oxygenArteries have thick walls to withstand the pressure Ca
pilla
ries Smallest of the blood
vesselsNarrow walls, delivers the oxygen and nutrients to the tissues
Vein
s Once the blood has passed through the capillary and no longer has oxygen it goes back to the heart in the veinOnce in the heart it can be pumped to the lungs for more oxygenVeins have valves to keep the blood moving to the heart
Circulation
Blood Pressure
•Your heart produces pressure•The force of the blood on the walls of the arteries is known as BLOOD PRESSURE•Without pressure, blood would stop flowing
Diseases of the Circulatory System
High Blood Pressure
• Aka Hypertension• Heart works harder• Can cause heart
attack or stroke
Atherosclerosis
• Fatty deposits called plaque build up on the inner walls of the arteries
• If the artery is blocked, oxygen cannot make its way to the body or the heart=heart attack
Valve Problems
• Can be damaged due to disease or birth defects
• Causes blood to flow backwards or inefficiently
• Lack of oxygen to the body
Do you have a Heart Murmur? What is it?
Case Study—A look at Long QT
Answer the following during the first video Clip-1. What is the electrical activity of the
heart responsible for?2.
Briefly describe what happened to Kevin Oill.
3.How does a defibrillator work?
4.What evidence did the medical team use to diagnose Kevin's Long QT Syndrome?
Answer the following during the second video Clip-1. How was Kevin's disorder treated
with technology?2.
What did Dr. Zipes mean by the phrase "umbilical cord attached to medical therapy?"
3.What are pacemakers? How have they evolved? What are the pros and cons of living with a pacemaker?