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Solution


Q.

Read the passage given below and answer the following questions from (i) to (v):

As the heart beats, it pumps blood through a system of blood vessels, called the circulatory system. The vessels are elastic, muscular tubes that carry blood to every part of the body. Blood is essential. In addition to carrying fresh oxygen from the lungs and nutrients to the body's tissues, it also takes the body's waste products, including carbon dioxide, away from the tissues. This is necessary to sustain life and promote the health of all parts of the body.
When we are injured and start bleeding, the loss of blood from the system has to be minimised. In addition, leakage would lead to a loss of pressure which would reduce the efficiency of the pumping system.

 

(ii) What is the correct representation of normal blood pressure of a human being
1 180/20 mm of Hg  
2 120/80 mm of Hg  
3 80/120 mm of Hg  
4 20/180 mm of Hg  

Ans.

(2)