The Removal of Calcium Ions from the Cytosol of Skeletal

question 40

Multiple Choice

The removal of calcium ions from the cytosol of skeletal muscle causes

• A) the myosin binding sites on actin to be uncovered by tropomyosin.
• B) tropomyosin to change conformation and thereby move troponin molecules over cross-bridge binding sites.
• C) troponin to change conformation and thereby expose cross-bridge binding sites.
• D) the myosin binding sites on actin to be covered by tropomyosin.
• E) None of the choices is correct.

---

Definitions:

Plate Boundaries

Regions where two tectonic plates meet, which can result in geological activity such as earthquakes and volcanic eruptions.

Thermal Disturbance

Localized or widespread change in temperature that affects an area's thermal equilibrium, often caused by geological events.

Felsic Magmas

Magma that is rich in lighter elements such as silicon and oxygen, often producing lighter-colored volcanic rocks.

Intermediate Magmas

Magmas that have a composition between felsic and mafic, typically associated with andesitic volcanic eruptions.