A muscle that controls the diameter of an opening is a ..... muscle.

SKELETAL MUSCLE

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Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]

A muscle that controls the diameter of an opening is a ____ muscle.

A	parallel
B	convergent
C	bipennate
D	circular

Explanation:

Detailed explanation-1: -The orbicularis oris which controls the opening of the mouth is an example of a circular muscle. Types of muscle in the body: The four types of muscle; parallel (fusiform and non-fusiform), circular, convergent and pennate (uni, bi and multi).

Detailed explanation-2: -Circular muscles are striated muscles that form a circular shape. Examples of circular muscles are the orbicularis oris, the muscle surrounding the mouth, and the orbicularis oculi, the muscles surrounding the eyes.

Detailed explanation-3: -In human anatomy, the orbicularis oris muscle is a complex of muscles in the lips that encircles the mouth. It is a sphincter, or circular muscle, but it is actually composed of four independent quadrants that interlace and give only an appearance of circularity.

There is 1 question to complete.