Question

question 13 (1.7 points)
myoglobin __________.
a) breaks down glycogen
b) produces the end plate potential
c) stores oxygen in muscle cells
d) is a protein involved in the direct phosphorylation of adp
question 14 (1.7 points) ✓ saved
exhaustion of glycogen storage within a muscle fiber would have the biggest effe on __________.
a) fast oxidative fibers

Explanation:

Myoglobin is an oxygen - binding protein found in muscle cells. It has a higher affinity for oxygen than hemoglobin. Its main function is to store oxygen within muscle cells, which can be released during periods of increased muscular activity when oxygen demand is high.

• Option A: Glycogen breakdown is mainly regulated by enzymes like glycogen phosphorylase, not myoglobin.
• Option B: The end - plate potential is generated by the release of neurotransmitters (such as acetylcholine) at the neuromuscular junction, not by myoglobin.
• Option D: Direct phosphorylation of ADP (e.g., in the creatine phosphate system) is not related to myoglobin.

Answer:

C. stores oxygen in muscle cells