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Seetal 04-15-2010 02:48 AM

nervous system increases the force of muscle contraction
 
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

laithbv 04-15-2010 01:30 PM

Is it C!
 
I think it's the frequency of firing but am not sure

achistikbenny 04-15-2010 08:12 PM

the ans is D.

ashishkabir 04-15-2010 08:37 PM

I'm thinking C too

Seetal 04-16-2010 03:40 PM

the answer is C guys. good job!:)


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