Physiology Quiz: Skeletal Muscle Physiology - Part 1

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Home > Daily Quiz > Skeletal Muscle Physiology - Part 1

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Physiology Quiz -
Skeletal Muscle Physiology - Part 1

Skeletal muscle cells are characterized by their striated appearance when visualized under the light and electron microscopes. Collectively, skeletal muscle cells make up approximately 50% of the body’s wet (i.e., soft tissue) weight. Skeletal muscle cells perform highly important functions including generating force, motion, and even heat. Test your basic knowledge of skeletal muscle physiology by taking this simple quiz.

(1) The following ion(s) is/are involved in the skeletal muscle action potential:

	(A) Sodium (Na⁺)
	(B) Potassium (K⁺)
	(C) Calcium (Ca²⁺)
	(D) Chloride (Cl⁻)
	(E) All of the above

(2) Under normal physiological conditions, the sarcoplasmic ATP concentration is about:

	(A) 3-5 pM
	(B) 3-5 nM
	(C) 3-5 μM
	(D) 3-5 mM
	(E) 3-5 M

(3) This enzyme is responsible for the breakdown of acetylcholine at the neuromuscular junction:

(4) Ca²⁺ is involved in all of the following in human skeletal muscle cells EXCEPT:

	(A) Binding to troponin
	(B) Ca²⁺ release from sarcoplasmic reticulum through the ryanodine receptors
	(C) Ca²⁺-transport into the sarcoplasmic reticulum by the Ca²⁺-ATPase
	(D) Spike phase of the action potentials of skeletal muscle cells
	(E) Ca²⁺ is involved in all of the above

(5) Which one of the following is NOT located in the striated muscle sarcomere unit?

	(A) Actin
	(B) Myosin
	(C) Tropomyosin
	(D) Dihyropyridine (DHP) receptor
	(E) Troponin

Checking your answers...

Posted: Monday, September 15, 2014