Which of the following best describes single-unit smooth muscle tissue?

a. The fibers function individually.

b. It is found in organs that require precise control of contraction.

c. It contains gap junctions that couple the fibers electrically.

d. The amount of tension produced varies with the number of muscle cells recruited.

Video transcript

Hey, everyone. Let's take a look at this question together. The single unit smooth muscle produces. Which type of contraction is it? Answer choice. A fast and intermittent answer. Choice B depends on the voluntary control. Answer choice, C overlapping or answer choice D slow and steady. Let's work this problem out together to try to figure out which of the following answer choices is the type of contraction that is produced by a single unit smooth muscle. So in order to solve this question, we have to recall what we have learned about what a single unit smooth muscle is and what type of contraction it produces. And we can recall that a single unit smooth muscle contraction is a contraction that is both rhythmic and sustained since they are slow and steady. And an example of a single unit smooth muscle contraction would be peristalsis in the digestive tract in which there is a co-ordination of the single unit smooth muscle contraction to help inefficient movement of the substances through the digestive tract. So it is rhythmic and sustained as a result of those contractions being slow and steady. So answer choice, d slow and steady is the correct answer and all other answer choices are incorrect. Since answer choice A B and C are characteristics of skeletal muscle contractions and not smooth muscle contractions. So they are incorrect. And answer choice D is the only correct answer choice. I hope you found this video to be helpful. Thank you and goodbye.