The first heart sound occurs at:
- AOpening of semilunar valve
- BClosing of semilunar valve
- COnset of auricular systole
- DSudden closure of $A.V.$ valves
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Similar Questions
Match the valves of the human heart in column $I$ with the respective opening they guard in column $II$ and select the correct option.
Column $I$ Column $II$ $i$. Eustachian valve $a$. Opening of pulmonary aorta $ii$. Thebesian valve $b$. Left atrioventricular aperture $iii$. Mitral valve $c$. Opening of inferior vena cava $iv$. Semilunar valve $d$. Opening of coronary sinus
| Column $I$ | Column $II$ |
| $i$. Eustachian valve | $a$. Opening of pulmonary aorta |
| $ii$. Thebesian valve | $b$. Left atrioventricular aperture |
| $iii$. Mitral valve | $c$. Opening of inferior vena cava |
| $iv$. Semilunar valve | $d$. Opening of coronary sinus |
Where is the bicuspid valve located in the human heart?
Easy
View SolutionSelect the correct option:
$(1)$ The pericardium is a double-layered membrane surrounding the heart.
$(2)$ The $SA$ node has a higher rate of impulse generation compared to the $AV$ node.
$(1)$ The pericardium is a double-layered membrane surrounding the heart.
$(2)$ The $SA$ node has a higher rate of impulse generation compared to the $AV$ node.
Easy
View SolutionThe heart beats continuously throughout life without fatigue because.....
Medium
View SolutionWhich one of the following is a matching pair?
Medium
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