Which structure generates an action potential without any external stimulus?
- A$SA$ node
- B$AV$ node
- C$AV$ bundle
- DPurkinje fibers
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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 |
Explain in short: $Lub$ and $Dub$ sounds.
Easy
View SolutionThe trilobed valve present between the right atrium and the right ventricle in the mammalian heart is known as:
MediumAIPMT 1993
View SolutionIf due to some injury the chordae tendinae of the tricuspid valve of the human heart is partially non-functional,what will be the immediate effect?
MediumAIPMT 2010
View SolutionThe heart of an elephant is
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