When a voluntary movement such as contracting one's right biceps is generated, what other signals, if any, must accompany this command?
A)A signal to antagonist muscles, such as the right triceps, to relax.
B)A signal to antagonist muscles, such as the right triceps, to flex simultaneously.
C)A signal to antagonist muscles, such as the left biceps, to relax.
D)No other signal is necessary.

Question

Quizplus · Accepted Answer

When a voluntary movement is generated, the signal to the agonist muscle, in this case the right biceps, will also be accompanied by a signal to the antagonist muscle, in this case the right triceps, to relax, allowing the agonist muscle to contract without resistance. Therefore, choice A is the correct answer. Choice B is incorrect because contracting the antagonist muscle simultaneously would interfere with the movement of the agonist muscle. Choice C is incorrect because signaling the left biceps to relax is unrelated to the movement of the right biceps. Choice D is also incorrect because a signal to the antagonist muscle is necessary.

When a Voluntary Movement Such as Contracting One's Right Biceps