In order to get a muscle to shorten what must you supply to it?
a stimulus in the form of a neuron
In order to get a muscle to shorten or contract, you need to supply it with a stimulus in the form of a nerve impulse from the nervous system. Muscles are made up of muscle fibers, which are controlled by motor neurons. When a motor neuron sends an impulse to a muscle fiber, it triggers a series of chemical reactions that cause the muscle fibers to contract. This contraction shortens the muscle, which allows it to produce movement or force.
In addition to the nerve impulse, the muscle also requires energy in the form of adenosine triphosphate (ATP) to fuel the contraction. ATP is generated from nutrients, primarily carbohydrates and fats, that are supplied to the muscle through the bloodstream. Oxygen is also required for the muscle to generate ATP, and so a steady supply of oxygen is essential for sustained muscle activity.
Overall, in order to get a muscle to shorten, you need to supply it with a nerve impulse, energy in the form of ATP, and oxygen to support ATP production.
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