1.

The diagram given alongside represents the human heart in one phase of its functions. Study the diagram carefully and answer the questions that follow :(i) Name the phase. (ii) Which part of the heart is contracting in this phase ? Give a reason to support your answer. (iii) Name the parts labelled 1 to 4. (iv) What type of blood flows through ‘2’ ? (v) State the function of the part numbered ‘5’ ? (vi) Name the membrane that covers the heart.

Answer»

(i) Ventricular Systole. 

(ii) Ventricle is contracting because both tricuspid and bicuspid valves are closed whereas both pulmonary semi-lunar and Aortic semilunar valves are open to pump the blood out of the two ventricles.

(iii) 1. Pulmonary artery 

2. Aorta 

3. Bicuspid/Mitral valve. 

4. Aortic semi-lunar valve 

5. Tricuspid values. 

(iv) Oxygenated blood flows through part 2. 

(v) Allow deoxygenated blood to flow from right ventricle to lungs and prevents its back flow. 

(vi) Pericardium.



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