Which of the following statements regarding whole-muscle contraction is TRUE?

A. The order of recruitment of motor units in a muscle is such that the last units recruited are those that fatigue most readily.
B. Motor units whose motor neurons have large-diameter cell bodies are recruited first, while motor units with smaller-diameter motor neurons are only activated as the level of activation in the spinal cord increases.
C. The order of recruitment of motor units in a muscle is such that the first units recruited generate the most tension.
D. Recruitment of one fast-glycolytic motor unit provides a smaller increment in whole-muscle tension than recruitment of one slow-oxidative motor unit.
E. The order of motor unit recruitment is independent of the size of the alpha motor neuron that innervates them.


Answer: A

Anatomy & Physiology

You might also like to view...

Permitting the exchange of nutrients and gases between the blood and tissue cells is the primary function of ________

A) capillaries B) arterioles C) veins D) arteries

Anatomy & Physiology

The type of organic molecule that can replicate is a

A. nucleic acid. B. lipid. C. protein. D. carbohydrate.

Anatomy & Physiology

What structure does "B" represent on the diagram of the plasma membrane?

A. Phospholipid bilayer B. Integral protein C. Membrane channel protein D. Internal membrane surface E. Peripheral protein

Anatomy & Physiology

The thalamus receives precortical sensory input from all of the following modalities except:

A) general somatic sense B) gustation C) vision D) audition E) olfaction

Anatomy & Physiology