The Force of Contraction of Skeletal Muscle Can Be Increased

Multiple Choice

The force of contraction of skeletal muscle can be increased by:

A) Activation of additional skeletal muscle fibers within a motor unit.
B) Increase in the frequency of action potentials within a skeletal muscle fiber.
C) Increase in β-adrenergic stimulation of the skeletal muscle.
D) Increase in myosin light chain phosphorylation in the skeletal muscle.
E) Increase in Ca⁺⁺ extrusion from the skeletal muscle fiber.