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Question

Assertion: The heart of frog continues to beat for some time when it is taken out of the body.

Reason: Frog's heart is myogenic in nature.

A
Both A and R are true and R is the correct explanation of A
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B
Both A and R are true and R is not the correct explanation of A
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C
A is true but R is false
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D
A is false but R is true
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Solution

The correct option is A Both A and R are true and R is the correct explanation of A
The heart of a frog is myogenic in nature as it can contract without getting stimuli from the nerve cells. The contractions are initiated within the heart by specialised cardiac muscles known as nodal tissue. The heart beat is generated by pacemaker made up of cardiac muscles. This property of self- excitation causes the heart to beat in a moist condition outside the body for some time. The pacemaker cells maintains the rhythm of the heart.

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