Posted: July 24th, 2017

The nervous system increases the force of muscle contraction in a graded fashion primarily by recruitment of active motor units and by increasing which of the following?

The nervous system increases the force of
muscle contraction in a graded fashion primarily
by recruitment of active motor units and by
increasing which of the following?
(A) Amplitude of action potentials of single
motoneurons
(B) Duration of action potentials in single
motor nerve fibers
(C) Frequency of firing of individual
motoneurons
(D) Number of active end-plates on the
muscle fiber
(E) Rate of synthesis of acetylcholine at the
motor nerve terminal