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TRANSCRIPT
Respiratory System
Do Now
Matching Quiz!
Peer Corrections
Homework Due Today
Read 33.3 – The Respiratory System
Define Larynx Pharynx Trachea Diaphragm
Homework Review
Larynx Contains 2 highly elastic folds of tissue known as the vocal
cords
Pharynx Cavity at the back of the mouth in which air passes
Trachea Windpipe
Diaphragm At the bottom of the chest cavity; large dome-shaped muscle
responsible for creating ‘negative pressure’ to allow for respiration
Homework Due Friday
Read 35.1
Answer questions 1a, 1b, 2a on page 1013
Respiratory System
What does it do? Picks up oxygen from air we inhale Release Carbon Dioxide (CO2) in the air we
exhale
Respiratory System Structures
Nose
Pharynx
Larynx
Trachea
Lungs
Bronchus
Bronchioles
Alveoli
Gas Exchange
What gases need to be “exchanged”?
Alveoli – End of air flow
Oxygen dissolves into moisture, then diffuses across capillary walls into blood Diffuses across because the oxygen
concentration is less inside the blood CO2 diffuses into alveoli from capillaries
because the concentration of CO2 is less in the alveoli
Flowchart Exercise!
Using the given words, create a flowchart to show the passage of oxygen into the blood stream Bronchioles Larynx Nose Alveoli Pharynx Bronchus Capillary Trachea
Diffusion
Moving from high concentration to low concentration 100 people in Athletic Office “Passive Process”
Diffusion of oxygen occurs until concentrations are the same
Hemoglobin binds to dissolved oxygen, removing it from plasma, allowing for more diffusion 60 times more!
Breathing
Majority of breathing is voluntary
However, whether conscious or unconscious, nervous system has the ‘final say’ Medulla oblongata
Helps the body function when unconscious Breathing BP Heart rate
Smoking & Respiratory System
3 most dangerous substances Nicotine Carbon Monoxide Tar
Smoking
Nicotine Addictive stimulant Increases HR and BP
Carbon Monoxide (CO) Poisonous gas Blocks hemoglobin from binding with oxygen
Tar Contains at least 60 compounds known to cause
cancer
Homework Due Friday
Read 35.1
Answer questions 1a, 1b, 2a on page 1013