In biology, the word contract means the shortening or size reduction. The heart muscle tissues can contract even in the absence of nervous stimulations. Thus, option A is correct.
The heart is an organ that makes the circulatory system and is composed of the involuntary cardiac muscles. It is crucial for blood circulation and pumps oxygen-rich blood to the body parts by rhythmic relaxation and contraction.
The cardiac muscle tissues show the property of automaticity, where the muscles are able to contract longer than the skeletal muscles even in the absence of nerve stimulation. They have specialized cells that allow them to work in the absence of nerve input.
Therefore, option A. heart can contract in the absence of nerve stimulation is correct.
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