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Question
Sketch and label the ventral view of the human heart.
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Solution
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Why is the SA node called the pace-maker of the heart?
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In embryological stage right and left auricles are communicated by.
Answer in only one sentence of the following question:
Mention the role of the pacemaker in human heart.
The diagram given below represents the human heart in one phase of its functional activities. Study the same and answer the questions that follow:
(i) Name the phase.
(ii) Label the parts 1, 2 and 3
(iii) Which part of the heart is contracting in this phase ? Give a reason to support your answer.
Column 2 is a list of items related to ideas in Column 1. Match the term in Column 2 with the suitable idea given in Column 1.
| Column 1 | Column 2 |
| (i) Superior vena cava | (a) Collect deoxygenated blood from the wall of the heart. |
| (ii) Inferior vena cava | (b) Carry oxygenated blood to heart muscle. |
| (iii) Pulmonary vein | (c) Collects deoxygenated blood from upper part. |
| (iv) Coronary veins | (d) Collects deoxygenated blood from lower parts. |
| (v) Coronary artery | (e) Brings oxygenated blood from lungs. |
| (vi) Aorta | (f) Large artery |
| (vii) Heart attack | (g) Large vein |
| (viii) Blood Pressure | (h) Oxygenated blood |
| (ix) Tricuspid valve | (i) Sphygmomanometer |
| (x) Bicuspid valve | (j) Allows blood flow from right auricle to right ventricle. |
| (xi) Contraction and relaxation of heart | (k) Blocking of coronary arteries. |
| (l) Cardiac muscle. | |
| (m) Allows blood flow from left auricle to left ventricle. | |
| (n) Allows blood flow from right ventricle of pulmonary aorta. |
The number of chambers in human heart are _______
______ is the opening of the upper chamber of the heart into the lower chamber.
The back flow of blood during the pumping of blood by the heart is prevented by:
A man's heart rate is 68 and cardiac output is 5440. Find the stroke volume.
