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. 19-22 Complete sentences, neatness counts

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.

Trace a molecule of oxygen to a cell in the body Figure 37-14 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

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

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

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

Smokers lung and healthy lung