Question

Which of the following muscles are not able to contract voluntarily?

• A. Duodenal muscles
• B. Pharyngeal muscles
• C. Skeletal muscles
• D. Lip muscles

Answer 1

The correct option is A Duodenal muscles

Muscles which are able to contract voluntarily are only skeletal muscles.

A) Duodenal muscles are not skeletal but smooth muscles and are therefore not able to contract voluntarily.

B) Pharangeal muscles are skeletal muscles and are hence able to contract voluntarily.

C) Skeletal muscles are under voluntary control and can be contracted voluntarily.

D) Lip muscles are skeletal muscles and are hence able to contract voluntarily.

So, the answer is 'duodenal muscles'.