If receptors in muscle fibers are thought of as locks, the keys are:

1 answer:

5 0

If the receptors in muscle fibers are thought of as locks, the keys are NEUROTRANSMITTERS.
Receptors are large protein molecules which are located on the surface of neuron. They have to be opened before a neuron is activated, that is why they are considered as lock. The neurotransmitter molecules are considered as the key, because they bind to the neuron and activate neural firing.

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<h3>What are Experiments?</h3>

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Therefore, we can conclude that according to the research, the correct option is control. Experiments are carried out to test a hypothesis by changing one variable at a time and including an unchanged variable termed a <u>control</u>.

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