Q2 of 95 Page 87

Where are the following located?
(i) Tricuspid valve

(ii) Mitral valve

(iii) Pulmonary semilunar valves

(i) Tricuspid valve is located at the aperture between the right auricle and the right ventricle.

(ii) Mitral valve also known as the bicuspid or the left artrio – ventricular valve is located in between the left auricle and the left ventricle.

(iii) Pulmonary semilunar valves are located at the opening of the right ventricle into the pulmonary artery.

Given below is a diagram of a smear of human blood. Study 4 the same and answer the questions that follow:

(a) Name the parts 1, 2, 3 and 4 indicated by guidelines.

(b) Mention two structural differences between the parts labelled ' 1' and '2'.

(d) What is the lifespan of the part labelled '1'?

(e) Name a soluble protein found in '4' which helps in the clotting of blood.

Fill in the blanks:

(i) Ventricles have …………………………walls when compared with those of auricles.

(ii) Ventricles give rise to two large blood vessels called ……………………and …………………………

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

Name the following:

(i) Contraction phase of the heart.

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

Questions · 95

7. The Circulatory System

1 2 3 4 1 1 1 1 2 1 2 2 2 2 1 2 1 2 2 1 2 3 4 1 2 3 4 5 1 1 2 3 1 2 1 1 2 3 1 2 3 4 5 6 1 2 3 4 5 6 7 1 2 3 3 3 3 3 3 3 3 3 3 4 5 6 7 1 2 3 4 5 6 1 1 1 1 2 3 4 5 5 5 5 5 5 1 2 3 4 5 6 7 8 9

Where are the following located?(i) Tricuspid valve(ii) Mitral valve(iii) Pulmonary semilunar valves