6. Describe the pleura. Into what divisions does it separate the thoracic cavity?
7. Describe and name uses of the diaphragm.
8. If 30 cubic inches of air are passed into the lungs at each inspiration and .05 of this is retained as oxygen, calculate the number of cubic feet of oxygen consumed each day, if the number of inspirations be 18 per minute.
9. Find the weight of a day's supply of oxygen, as found in the above problem, allowing 1.3 ounces as the weight of a cubic foot.
10. Make a study of the hygienic ventilation of the schoolroom.
[pg 101]11. Give advantages of full breathing over shallow breathing.
12. How may a flat chest and round shoulders be a cause of consumption? How may these deformities be corrected?
13. Give general directions for applying artificial respiration.
PRACTICAL WORK
Examine a dissectible model of the chest and its contents (Fig. 49). Note the relative size of the two lungs and their position with reference to the heart and diaphragm. Compare the side to side and vertical diameters of the cavity. Trace the air tubes from the trachea to their smallest divisions.