The speed with which force is developed by skeletal muscles is determined by the
A) Ca2+ ATPase activity.
B) sarcoplasmic calcium concentration.
C) myosin ATPase isoform.
D) Ca2+ ATPase activity and sarcoplasmic calcium concentration.
E) Ca2+ ATPase activity, myosin ATPase isoform, and sarcoplasmic calcium concentration.
Answer: : C