Marine mammals are unable to breathe air during periods of prolonged diving. To enable such feats, in relation to their muscle physiology, they have
A. increased myoglobin concentrations.
B. increased capillary densities.
C. increased amounts of sarcoplasmic reticulum.
D. increased expression of acetylcholine receptors.
E. All of the choices for this question are correct.
A. increased myoglobin concentrations.
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What will be an ideal response?