MUSCLE
SKELETAL MUSCLE
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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a source of energy for muscle contraction
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a component of thick myofilaments
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a neurotransmitter that stimulates skeletal muscle
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an oxygen-binding protein
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Detailed explanation-1: -Acetylcholine is the chief neurotransmitter of the parasympathetic nervous system, the part of the autonomic nervous system (a branch of the peripheral nervous system) that contracts smooth muscles, dilates blood vessels, increases bodily secretions, and slows heart rate.
Detailed explanation-2: -When acetylcholine reaches receptors on the membranes of muscle fibers, membrane channels open and the process that contracts a relaxed muscle fibers begins: Open channels allow an influx of sodium ions into the cytoplasm of the muscle fiber.
Detailed explanation-3: -When a motor nerve cell gets the proper signal from the nervous system, it releases acetylcholine into its synapses with muscle cells. There, acetylcholine opens receptors on the muscle cells, triggering the process of contraction.