Which of the following types of muscle tissue is responsible for peristalsis in the sigmoid colon?

Rationale

Smooth muscle tissue is responsible for peristalsis in the sigmoid colon.

Smooth muscle tissue contracts involuntarily and is found in the walls of hollow organs, including the intestines. Peristalsis, the wave-like movement that propels contents through the digestive tract, is primarily facilitated by this type of muscle.

A (Smooth) CORRECT

Smooth muscle is specifically designed for involuntary movements and is found throughout the gastrointestinal tract, including the sigmoid colon. It enables peristalsis by contracting rhythmically to move food and waste through the intestines, making it the correct choice.

B (Skeletal) YOUR ANSWER

Skeletal muscle is under voluntary control and is responsible for movements of the skeleton. It does not function in the involuntary processes of digestion or peristalsis, as it is primarily used for activities like walking or lifting. Therefore, it is not involved in the movement of contents through the sigmoid colon.

C (Cardiac) YOUR ANSWER

Cardiac muscle is found exclusively in the heart and is responsible for pumping blood throughout the body. Like skeletal muscle, it is not involved in the movements of the digestive system or peristalsis, making it an incorrect choice in this context.

D (Striated) YOUR ANSWER

Striated muscle refers to both skeletal and cardiac muscle, characterized by its striped appearance under a microscope. However, striated muscle does not perform peristalsis; only smooth muscle tissue is involved in this process within the sigmoid colon.

Conclusion

Peristalsis in the sigmoid colon is solely the function of smooth muscle tissue, which allows for the involuntary movement necessary for digestion. In contrast, skeletal and cardiac muscles serve different roles unrelated to this digestive process. Understanding the distinctions between muscle types is essential for comprehending their specific functions within the body.

Which of the following types of muscle tissue is responsible for peristalsis in the sigmoid colon?

Smooth muscle tissue is responsible for peristalsis in the sigmoid colon.

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