問題詳情
41. Diving mammals like whales and seals experience frequent periods when they are not able to breathe air. Which of thefollowing is a muscle adaptation they show to this challenge?
(A)increased capillary densities
(B)increased myoglobin concentrations
(C) increased amounts of sarcoplasmic reticulum
(D)increased expression of acetylcholine receptors
參考答案