Question

A frog's heart, when taken out of its body, continues to beat for sometime. Select the best option from the following statements.
(a) Frog is a poikilotherm.
(b) Frog does not have any coronary circulation.
(c) Heart is "myogenic" in nature.
(d) Heart is autoexcitable.

• A. Only (c)
• B. Only (d)
• C. (a) and (b)
• D. (c) and (d)

Answer 1

The correct option is D (c) and (d)

A frog's heart originates from muscle tissue and not from nerve impulse (myogenic). It is autoexcitable which means it does not need external stimuli.
When a frog's heart is taken out of the body, it continues to beat for some time because it is not dependent on the nervous system and does not require an external stimuli.