Q1 of 95 Page 88

Name the following:

(i) Contraction phase of the heart.


(ii) The structure that holds the heart valves in position.

(i) The contraction phase of the heart is known as systole. During systole, the atria contracts first followed by the ventricles.

(ii) The structure that holds the heart valves in position is known as the chordae tendinae.


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2

Where are the following located?

(i) Tricuspid valve


(ii) Mitral valve


(iii) Pulmonary semilunar valves

 3

Can you answer why the pulmonary artery shown in Fig. 7.6 is blue in colour?

 2

Mention the phase of heart beat in which both the atrio-ventricular valves are closed.

 1

Fill in the blanks

(i) The ……………………… have thin and less muscular …………………… and have ……………..to prevent backflow of ……………….


(ii) …………………….carry blood to an organ and break up into ………......ending in capillaries.


(iii) Walls of capillaries consist of a single layer of squamous ………………… cells.


(iv) The substances to and from the tissues diffuse through the walls of …………………….