Question

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

Answer 1

(i) Ventricular Systole.

(ii) Ventricle is contracting because both tricuspid and bicuspid valves are closed whereas both pulmonary semi-lunar and Aortic semi-lunar 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. Pulmonary valve.

(iv) Oxygenated blood flows through part 2 to the whole body.

(v) Allow deoxygenated blood to flow from the right ventricle to the lungs as it prevents its backflow.

(vi) The pericardium is the outer membrane that covers the heart.