The frog's heart, when taken out of the body, continues to beat for sometime.Select the best reason for this from the following statements. (1) The frog is a poikilotherm. (2) The frog does not have any coronary circulation. (3) Its heart is "myogenic" in nature. (4) Its heart is autoexcitable.
Correct answer: C. (3) and (4)
- A. Only (4)
- B. (1) and (2)
- C. (3) and (4)
- D. Only (3)
Explanation
The frog's heart is myogenic, i.e. its heartbeat originates from muscles of heart. Hence, it is autorythmic. A wave of contraction originates from the sinus venosus and spreads to the wall of sinus venosus and both auricles. This compels the heart to beat. Due to this reason, the frog's heart will continue to beat as long as it gets a supply of ATP.
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