Chapter 3

Question 1

All-or-None Principle

Answer 1

o is the principle that the strength by which a nerve or muscle fiber responds to a stimulus is independent of the strength of the stimulus

Question 2

Size Principle of Recruitment

Answer 2

o states that under load, motor units are recruited from smallest to largest

Question 3

Compartmentalization

Answer 3

o is a subconscious psychological defense mechanism used to avoid cognitive dissonance, or the mental discomfort and anxiety caused by a person’s having conflicting values, cognitions, emotions, beliefs, etc. within themselves

Question 4

Stretch-Shorten Cycle

Answer 4

o Is an active stretch (eccentric contraction) of a muscle followed by an immediate shortening (concentric contraction) of that same muscle

Question 5

Agonist

Answer 5

o Muscles directly involved in producing desired movement; can be either prime movers or synergists

Question 6

Antagonist

Answer 6

o Muscles that oppose the action of the antagonist