The diagram below represents the human heart in one phase of its fun

1.	The diagram below represents the human heart in one phase of its functions. Study the diagram carefully and answer the questions that follows : (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) Both ventricles are contracting in this phase, because both bicuspid and bicuspid valves are closed in order to prevent the back flow of blood into auricles and the semilunar valves are open. (iii) 1- Pulmonary artery 2- Aorta 3- Bicuspid valve 4- Semilunar valve (iv) '2' carries oxygenated blood. (v) Part 5 is semilunar valve through which blood passes into aorta and pulmonary artery and prevents the backflow of blood into the ventricles. (vi) Pericardium.

The diagram below represents the human heart in one phase of its functions. Study the diagram carefully and answer the questions that follows : (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) Both ventricles are contracting in this phase, because both bicuspid and bicuspid valves are closed in order to prevent the back flow of blood into auricles and the semilunar valves are open.

(iii) 1- Pulmonary artery

2- Aorta

3- Bicuspid valve

4- Semilunar valve

(iv) '2' carries oxygenated blood.

(v) Part 5 is semilunar valve through which blood passes into aorta and pulmonary artery and prevents the backflow of blood into the ventricles.

(vi) Pericardium.

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