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Solution


Q.

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

A normal human heart is a strong, hard-working pump made of muscle tissues. It is about the size of a person’s fist. The heart comprises four chambers. The upper two chambers are known as atria, and the lower two are known as ventricles. These chambers are separated by a wall of tissue known as the septum. Blood is pumped through the chambers, assisted by four heart valves. The valves open and close to allow blood flow in only one direction.

 

(iii) Blood is pumped out to the body when:
1 left ventricle expands  
2 left atrium relaxes  
3 left atrium contracts  
4 left ventricle contracts  

Ans.

(4)