Which function is being fulfilled by a muscle that holds a bone steady during movement?

a. Antagonist

b. Synergist

c. Supinator

d. Fixator

Video transcript

Hey, everyone. Let's take a look at this question together. The biceps brachia is the primary muscle responsible for flexing the elbow. Meanwhile, the brachialis assists and contributes to the overall movement. The brachialis is an example of which type of muscle is it answer choice. A, a fixator answer choice B A Sator, answer choice, C an antagonist or answer choice D A synergist. Let's work this problem out together to try to figure out which of the following answer choices is the name for the type of muscle that the brachialis is in this example. So in order to solve this question, we have to recall what each of the following answer choices refers to as well as what we have learned about how the biceps brachia interacts with the brachialis which assists and contributes to the overall movement, which is the flexing of the elbow. So we know from the question that we have the biceps brachia, which is that primary muscle also known as the prime mover or the agonist, which is responsible for flexing the elbow. However, we know that we have the brachialis which aids the agonist. In this case, the biceps brachia to achieve elbow flexion. And we can recall that a muscle that aids the prime mover or the agonist to it achieve that overall movement. In this case, elbow flexion is known as a synergist muscle, which is answer choice D, the correct answer since the brachialis is considered a synergist muscle because it assists and works with the biceps brachia in achieving that common goal of elbow flexion. So answer choice D is the only correct answer choice. I hope you found this video to be helpful. Thank you and goodbye.