Which Sphincter Is Composed of Skeletal Muscle Between the Anus

question 75

Multiple Choice

Which sphincter is composed of skeletal muscle between the anus and external environment?

• A)internal anal sphincter
• B)lower esophageal sphincter
• C)external anal sphincter
• D)upper esophageal sphincter
• E)sphincter of Oddi

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Definitions:

Heparin

An anticoagulant medication or naturally occurring substance that prevents the formation of blood clots.

SRS-A

A group of chemical mediators known as slow-reacting substances of anaphylaxis, involved in allergic reactions.

Arteriole Walls

The thin-walled blood vessels that regulate blood flow from arteries to capillaries, majorly affecting blood pressure and flow.

Vasodilate

The process of widening blood vessels to increase blood flow.