NEET 2017 · BiologyPrevious Year Question
Frog's heart when taken out of the body continues to beat for some time. 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 Choose the correct option:
Answer: (D) (c) & (d). Answer: (d) (c) & (d) Solution: A frog's heart keeps beating after removal because its activity is intrinsic to the heart muscle itself.
- A.Only (c)
- B.Only (d)
- C.(a) & (b)
- D.(c) & (d)✓
Correct Answer
(D) (c) & (d)
Solution & Explanation
Answer: (d) (c) & (d) Solution: A frog's heart keeps beating after removal because its activity is intrinsic to the heart muscle itself. The heart is myogenic (auto-regulated by its nodal tissue) and the nodal musculature is autoexcitable, generating action potentials without any external stimuli. Hence statements (c) and (d) are correct. NCERT: Ch 15, p.202, line 9 — "auto regulated by specialised muscles (nodal tissue), hence the heart is called myogenic"
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