The Role of Ca²⁺ in the Control of Muscle Contraction

question 12

Multiple Choice

The role of Ca²⁺ in the control of muscle contraction is to

• A) cause depolarization of the T tubule system.
• B) change the conformation of troponin, thus exposing myosin-binding sites.
• C) change the conformation of myosin heads, thus causing microfilaments to slide past each other.
• D) bind to tropomyosin and break actin-myosin cross-bridges.
• E) block the ATP-binding site on myosin heads, enabling muscles to relax.

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Definitions:

Meaning

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Tantalus

A figure in Greek mythology who was punished in the afterlife by being made to stand in water that receded when he tried to drink and under a tree whose fruit always eluded his grasp.

Mythological

Pertaining to myths or the study of myths; relating to, based on, or appearing in myths.

Nietzsche

A German philosopher, cultural critic, and poet, known for his critiques of the morals and religion of his time, emphasizing the importance of individualism and will to power.