Anatomy & Physiology Musculoskeletal #24

Question

Which statement regarding smooth muscles within the human body is true?

Answers

  1. Smooth muscles are striated.
    • Rationale:

      Smooth muscle is not striated, but smooth in appearance; therefore, this is not a true statement about this type of muscle within the human body.

  2. Smooth muscles are under voluntary control.
    • Rationale:

      Smooth muscles are under involuntary, not voluntary, control; therefore, this is not a true statement about this type of muscle within the human body.

  3. Smooth muscles are responsible for peristalsis.
    • Rationale:

      Smooth muscles are the involuntary muscles that control the movements and actions of the internal organs and systems within the human body body. Smooth muscles found in the gastrointestinal tract perform peristalsis allowing for the movement of digested food along the tract.

  4. Smooth muscles found within the heart are voluntarily controlled.
    • Rationale:

      Cardiac muscle, not smooth muscle, tissue is found within the heart and it is not voluntarily controlled.

Overview

The musculoskeletal system is broken down into two subsystems, the muscular system and the skeletal system.

Explanation

Learning Outcomes

The muscular system can be described as having three different types of muscles. These muscles include cardiac, skeletal, and smooth muscles. Smooth muscles are not striated and appear smooth. In addition, smooth muscles are typically not under voluntary control within the body and they are not found within the heart. Therefore, the true statement is that smooth muscles are responsible for peristalsis within the gastrointestinal system.

Test Taking Tip

Ask yourself if each statement is true or false. The true statement is the correct choice for this question.

Video Rationale