4. What part is played by the capillaries and the lacteals in the work of absorption? How does their work differ?
5. What changes, if any, take place in water, common salt, fat, proteids, and carbohydrates during absorption?
6. What double purpose is served by the processes of digestion?
7. Trace the passage of proteids, fats, and carbohydrates from the small intestine into the general circulation.
8. What is the necessity for storing nutrients in the body? Why is it not also necessary to store up oxygen?
9. In what form and at what places is each of the principal nutrients stored?
10. How is the rate of supply of food to the cells regulated? Why is the body unable to regulate the supply of alcohol to the cells when this substance is taken?
11. Explain Fig. 80, page 181. What becomes of the alcohol if this is taken in any but very small quantities?
12. State the general purpose of enzymes in the body. Name the enzymes found in each of the digestive fluids. What ones are found in the tissues?