List I | List II | ||
A. | Tricuspid valves | I. | Guards the opening between right atrium and right ventricle |
B. | Sino-atrial node | II. | Guards the opening between the left atrium and the left ventricle |
C. | Mitral valves | III. | Guards the opening of right and left ventricles into pulmonary artery and aorta, respectively |
D. | Semilunar valves | IV. | Cardiac musculature in the right upper corner of right atrium |
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyAll the components of the nodal tissue are autoexcitable. Why does the SA node act as the normal pacemaker?
1. | SA node has the lowest rate of depolarisation |
2. | SA node is the only component to generate the threshold potential. |
3. | Only SA node can convey the action potential to the other |
4. | SA node has the highest rate of depolarisation. |
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & Biology