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Question
The diagram given below represents a section of the human heart. Answer the questions that follow:
- Which parts of heart are in the diastolic phase? Give a reason to support your answer.
- Label the parts numbered 1 and 2 in the diagram. What type of blood flows through them?
- What causes the heart sounds ‘LUBB’ and ‘DUP’?
- Name the blood vessels that supply oxygenated blood to the heart muscles.
- Draw neat labelled diagrams of a cross section of an artery and a vein.
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Solution
- Ventricles are in the diastolic phase. The arrows indicate blood entering the ventricles. During a ventricular diastole, the valves between atria and ventricles open which allow the entry of blood into the ventricles.
- 1: Pulmonary artery
2: Pulmonary veins - Closing of the bicuspid and tricuspid valves causes the ‘LUBB’ sound, and the closing of semilunar valves causes the ‘DUP’ sound.
- Coronary arteries supply oxygenated blood to the heart muscles.
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