2. Do NowDo Now MMatching Quiz! PPeer Corrections

3. Homework Due TodayHomework Due Today  Read 33.3 – The Respiratory System  Define  Larynx  Pharynx  Trachea  Diaphragm

4. Homework ReviewHomework 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

5. Homework Due FridayHomework Due Friday  Read 35.1  Answer questions 1a, 1b, 2a on page 1013

6. Respiratory SystemRespiratory System WWhat does it do? PPicks up oxygen from air we inhale RRelease Carbon Dioxide (CO 2 ) in the air we exhale

7. Respiratory System Structures  Nose  Pharynx  Larynx  Trachea  Lungs  Bronchus  Bronchioles  Alveoli

8. Gas ExchangeGas 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  CO 2 diffuses into alveoli from capillaries because the concentration of CO 2 is less in the alveoli

9. Gas ExchangeGas Exchange  Respiratory System & Gas Exchange Respiratory System & Gas Exchange

10. Flowchart Exercise!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

11. 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!

12. 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

13. Smoking & Respiratory System  3 most dangerous substances  Nicotine  Carbon Monoxide  Tar

14. 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

15. Homework Due FridayHomework Due Friday  Read 35.1  Answer questions 1a, 1b, 2a on page 1013