Physiology Quiz -
Sarcomere - Part 2

The sarcomere is the functional unit of muscle cells. Test your basic knowledge of sarcomere structure and function by taking this simple quiz.

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(1) Which of the following is (are) true about the H zone in a striated muscle sarcomere unit?

	(A) This zone is the distance between the ends of the thin filaments that extend from opposite ends (Z disks) of the same sarcomere unit.
	(B) Its length is constant.
	(C) Its length is variable.
	(D) A and B only
	(E) A and C only

(2) This region within the sarcomere unit represents the length of the thick filaments:

	(A) A band
	(B) H zone
	(C) I band
	(D) The region spanning from one Z disk to the next
	(E) M line

(3) When a skeletal muscle cell contracts:

	(A) The A band shortens.
	(B) The I band decreases in size.
	(C) The H zone increases in size.
	(D) The Z lines of a sarcomere move away from one another.
	(E) None of the above is true.

(4) Name only one structural protein of the sarcomere.

(5) Name only one regulatory protein of the sarcomere.

Checking your answers...

Posted: Tuesday, September 9, 2014
Last updated: Tuesday, March 11, 2025

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Physiology Quiz -Sarcomere - Part 2