1. Aim: How does the Human Respiratory System maintain homeostasis?
HW #18
Read Text pages 956 to 963
Pg.963 section 37-3 ans. ques. 1-5
Pg.968 ques
Complete sentences, neatness counts

2. Respiration can be described…
At the cellular level – oxygen is used to break down glucose in the production of the high energy compound ATP (occurs in the mitochondria of the cell)
Groups: formula for aerobic respiration
At the organ level – structures bring air containing oxygen into the body where it can be transferred to the red blood cells.

3. Trace a molecule of oxygen to a cell in the body
Figure The Respiratory System
Trace a molecule of oxygen to a cell in the body
Section 37-3
Pharynx
Nose
Larynx
Trachea
Mouth
Bronchiole
Lung
Epiglottis
Bronchus
Alveoli
Bronchioles
Students will work in pairs to trace a molecule of oxygen to a cell (any cell) in the body. The molecule will pass through all parts of the respiratory system and diffuse through the membranes of the alveoli and capillary where the molecule will be picked up by the hemoglobin in the rbc and carried to a cell of the body. The molecule will again diffuse out of the rbc through the cell membrane to the mitochondria, where it will oxidize the glucose and produce ATP
Diaphragm
Capillaries
Edge of
pleural membrane

4. Figure 37-15 Gas Exchange in the Lungs
Alveoli
Section 37-3
Bronchiole
Gas exchange occurs by diffusion across the membrane of an alveolus and a capillary.
Where is oxygen more concentrated, in an alveolus or in the red blood cell in a capillary?
Capillary

5. Figure 37-16 The Mechanics of Breathing
Section 37-3
Air exhaled
Air inhaled
Rib cage descends
Rib cage rises
Diaphragm
Diaphragm
The diaphragm is a muscle that separates the pleural cavity from the abdominal cavity.
During inhalation, the diaphragm contracts, increasing the size of the chest cavity. The air enters
Inhalation
Exhalation

6. Figure 37-16 The Mechanics of Breathing
Section 37-3
Air exhaled
Air inhaled
Rib cage descends
Rib cage rises
Diaphragm
Diaphragm
Exhalation occurs when the diaphragm relaxes.
Heimlich manuever
Inhalation
Exhalation

7. Smokers lung and healthy lung