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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. |
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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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