Neuromuscular System

Question 1

All-or-none Principle

Answer 1

A stronger action potential cannot produce a stronger contraction.

Question 2

Tetanus

Answer 2

The maximal amount of force the motor unit can develop.

Question 3

Slow-twitch; high fatigue resistance and aerobic capacity; low force production.

Answer 3

Type I Muscle Fibers

Question 4

Fast-twitch; lower fatigue resistance and aerobic capacity; intermediate to high force production.

Answer 4

Type II Muscle Fibers

Question 5

Motor Units are composed of… that…

Answer 5

muscle fibers with specific morphological and physiological characteristics … determine their functional capacity.

Question 6

What 2 factors determine force output of a muscle?

Answer 6

Frequency of activation of individual motor units OR the number of motor units activated.

Question 7

Proprioceptors

Answer 7

Specialized sensory receptors located within joints, muscles, and tendons.

Question 8

What do proprioceptors do?

Answer 8

Provide the central nervous system with information needed to maintain muscle tone and perform complex coordinated movements.

Question 9

Muscle spindles

Answer 9

Proprioceptors that consist of several modified muscle fibers enclosed in a sheath of connective tissue.

Question 10

What are Golgi Tendon Organs (GTO’s) & where are they located?

Answer 10

Proprioceptors located in tendons.

Question 11

What do GTO’s do?

Answer 11

Inhibit muscle activation to protect against the development of excessive tension.