Chapter 9 pt. 2

consist if the motor neuron and all muscle fibers it supplies

• sarcolemma

• motor unit

• fiber

• muscle twitch

simplist contraction resulting from a muscle fiber's response to a single action potential from motor neuron

• sarcolemma

• motor unit

• fiber

• muscle twitch

twitch can be observed and recorded is also known as

• myogram

• motor unit

• fiber

• muscle twitch

occurs when no muscle tension is seen

• latent period

• period of contraction

• period of relaxation

the cross bridge forms, tension increases

• latent period

• period of contraction

• period of relaxation

tension declines to zero, calcium reenters the SR

• latent period

• period of contraction

• period of relaxation

Graded muscle responses are graded by: (2)

• changing frequency of stimulation

• changing strength of stimulation

• changing force of stimulation

• changing method of stimulation

result if two stimuli are recieved by a muscle in rapid succession

• wave (temporal) stimulation

• unfused (incomplete) tetanus

• fused (complete) tetanus

• threshold stimulus

stimuli increases, muscle tension reaches near maximum

• wave (temporal) stimulation

• unfused (incomplete) tetanus

• fused (complete) tetanus

• threshold stimulus

stimuli frequency further increases, muscle tension reaches maximum. there is one smooth sustained contraction

• wave (temporal) stimulation

• unfused (incomplete) tetanus

• fused (complete) tetanus

• threshold stimulus