NUTRITION
THE HUMAN BODY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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How do skeletal muscles contract?
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Muscles contract after receiving message from the brain through nerves. The filaments slide past each other and cause the fiber to shorten an contract.
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The push and pull of cartilage and tissue
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They are regulated by the negative feedback system.
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None of the above
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Explanation:
Detailed explanation-1: -The motor neurons release a chemical, which is picked up by the muscle fibre. This tells the muscle fibre to contract, which makes the muscles move. Neurons carry messages from the brain via the spinal cord. These messages are carried to the muscles which tell the muscle fibre to contract, which makes the muscles move.
Detailed explanation-2: -Muscle contraction occurs when sarcomeres shorten, as thick and thin filaments slide past each other, which is called the sliding filament model of muscle contraction. ATP provides the energy for cross-bridge formation and filament sliding.
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