А. М. Maslova Z. I. Winestein L. S. Plebeyskaya Essential English for Medical Students Second Edition, Revised and Enlarged

Read the passages and answer the questions:

1. 
   This substance is composed of plasma, red corpuscles, white corpuscles and platelets. What substance is it?
   
2. 
   These cellular elements are the most numerous in the blood. They range from 4 to 5 million per cu mm in healthy adults. Their colour(ing) is red. What cellular elements are they?
   
3. 
   This blood is brought to the heart from systemic and portal circulations. It enters the right atrium of the heart. Then this blood passes into the right ventricle. From the right ventricle this blood passes into the pulmonary artery. What blood is it?
   

16. 
    Revise Text В (Lesson 13) and say what heart valve is described in each sentence:
    

1. This valve connects the atrium and the ventricle of the left heart chamber.

2. 
   This valve connects the atrium and the ventricle of the right heart chamber.
   
3. 
   This valve is located at the point of origin of the aorta in the left ventricle. 4. This valve is located at the point of origin of the pulmonary artery in the right ventricle.
   

17. 
    Combine the nouns with appropriate verbs, putting them in the necessary form:
    

the heart, the blood, the artery
contract, pass, dilate, bring, pump, vary, beat, compose, work, consist of, discharge out, receive, enter, act, serve, send, oxygenate, carry

18.