Question

the heart must be stimulated by the nervous system to contract.
a true
b false

Explanation:

The heart is a myogenic organ. It has its own intrinsic rhythm and can contract on its own without being stimulated by the nervous system. The nervous system can modify the heart rate (e.g., the sympathetic nervous system can increase the heart rate and the parasympathetic nervous system can decrease it), but it is not required for the heart to contract initially.

Answer:

B. False