Ex. 20. Make up a dialogue on the urinary system

Ex. 21. Read the following text and retell it:

FUNCTIONS OF URINARY SYSTEM

The urinary system participates with other organs to regulate the volume and composition of the intestinal fluid. Exchange across the walls of capillaries provides nutrients and removes waste products from the interstitial spaces. Exchange of gas in the lungs removes carbon dioxide from the blood and provides a supply of oxygen. The digestive system supplies nutrients to the blood, and the liver removes certain waste products. These organ systems function together to regulate the level of gases, nutrients, and some waste products in the blood. The kidneys remove waste products, many of which are toxic, from the blood and play a major role in controlling blood volume, the concentration of ions in the blood, and the pH of the blood. The kidneys are also involved in the control of red blood cell production and vitamin D metabolism. Although the kidneys are the major excretory organs in the body; the skin, liver, lungs, and intestines also eliminate wastes. However, if the kidneys fail to function, other structures cannot adequately compensate to maintain a normal environment for the body cells.

Ex. 22. Give a summary of the following text: