Which of the following is a unique feature of the diaphragm?
A) It is the only smooth muscle in the human body.
B) It is the only smooth muscle that can be voluntarily controlled.
C) It is only found in humans.
D) It is the only skeletal muscle that is under involuntary control.
E) None of these are unique features.

Question

Quizplus · Accepted Answer

The diaphragm is not the only smooth muscle in the human body (there are many others such as the walls of the digestive tract). However, it is the only smooth muscle that can be voluntarily controlled, making it a unique feature of the body. A, C, and D are all incorrect statements.

Which of the Following Is a Unique Feature of the Diaphragm