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प्रश्न
Heart sounds are produced due to ______.
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closure of tricuspid and bicuspid valves
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rushing of blood through valves producing turbulence
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closure of atrioventricular and semilunar valves
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entry of blood into auricles
उत्तर
Heart sounds are produced due to closure of tricuspid and bicuspid valves and closure of atrioventricular and semilunar valves.
Explanation:
The first sound "LUBB" is produced when the atrio-ventricular (tricuspid and bicuspid) valves get closed sharply at the start of ventricular systole. The second sound "DUP" is produced when at the beginning of ventricular diastole, the semilunar valves at the roots of aorta and pulmonary artery get closed.
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संबंधित प्रश्न
The diagram below represents the human heart in one phase of its function. 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.
Name the following:
The artery which carries deoxygenated blood.
Name the following:
The blood vessels which start from capillaries and end in capillaries.
Why do people have a common belief that the heart is located on the left side of the chest?
Give reason for the following:
Atrial wall is less muscular than the ventricular wall.
Put a tick mark (✓) against the correct alternative in the following statement.
Pulmonary vein carries
During surgical operations or during accidents, the patient may be given blood from outside to save his life. What is the technical name of this process? Briefly explain the precautions to be taken in this process.
What is the location of maturation of T-lymphocytes?
Identify the normal haemoglobin count in human females.
Name the following :-
The cell organelle where photosynthesis occurs
