An "Internal Reservoir" of Oxygen in Rested Muscle is Found

Question

An "internal reservoir" of oxygen in rested muscle is found in oxygen molecules bound to
A)hemoglobin.
B)bicarbonate ions.
C)carbonic acid.
D)actin and myosin.
E)myoglobin.

Accepted Answer

Myoglobin is a protein that stores oxygen in muscle cells and serves as an internal reservoir for oxygen. Hemoglobin is a protein found in red blood cells that binds oxygen for transport, but it is not found in rested muscle cells. Bicarbonate ions and carbonic acid are involved in buffering the pH of the blood and have no direct role in oxygen storage in muscle. Actin and myosin are proteins involved in muscle contraction but are not involved in oxygen storage.