Given below are two statements:
Statement I: Skeletal muscles do not contract unless stimulated by neurons.
Statement II: Smooth and cardiac muscles can contract without nervous stimulation.
In the light of the above statements, choose the most appropriate answer from the options given below:
Text Solution
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• Skeletal muscles are under voluntary control.
• They require stimulation from motor neurons (neuromuscular junction, release of acetylcholine) to contract.
• Smooth muscles (like in intestine, uterus, blood vessels) and cardiac muscle (heart) are myogenic = they can contract on their own without direct nervous input.
• Nervous system only modulates their rate/strength, but contraction can happen without it.
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