The amount of force produced by a muscle at any given time is directly related to which of the following.
A . The number of myosin cross bridge heads that are attached to actin filaments
B . The number of actin cross bridge heads that are attached to myosin filaments
C . The strength of the attachment between the myosin cross bridge heads and the actin filaments
D . The strength of the attachment between the actin cross bridge heads and the myosin filaments
Answer: A