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Question
The diagram given below represents the human heart in one phase of its functions. Study the diagram carefully and answer the questions that follow:
- Name the phase.
- Which part of the heart is contracting in this phase? Give a reason to support your answer.
- Name the parts labelled 1 to 4.
- What type of blood flows through 2?
- State the function of the part numbered ‘5’.
- Name the membrane that covers the heart.
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Solution
- Ventricular systole
- Ventricles are contracting in this phase. In the diagram given, the tricuspid valve and bicuspid valve are closed, while the semilunar valves are open.
-
- Pulmonary artery
- Aorta
- Bicuspid valve
- Semilunar valve (aortic semilunar valve)
- Oxygenated blood flows through ‘2’, i.e., the aorta.
- Part ‘5’ is the pulmonary semilunar valve. It prevents the backflow of blood into the right ventricle at the time of ventricular diastole.
- Pericardium
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