Chapter 6: Vocabulary For Quiz Flashcards
increases angle between two bones
extension
thick filaments
myosin
movement of a limb away from the midline
abduction
single, brief contraction
twitch
muscle that aids a prime mover in a movement and helps prevent rotation
synergist
muscle with the major responsibility for a certain movement
prime mover
movement of a limb toward the midline
adduction
thin filaments
actin
movement of a bone around its longitudinal axis
rotation
forearm rotates laterally so palm facer anteriorly
supination
some relaxation occurs between contractions
unfused tetanus
brings two bones closer together
flexion
contraction where the muscle shortens and movement occurs
isotonic contractions
motor neuron and all the skeletal muscle cells stimulated by that neuron
motor unit
association site of axon terminal of the motor neuron and muscle
neuromuscular junction
forearm rotates medically so palm faces posteriorly
pronation
contraction where the muscle is unable to shorten or produce movement
isometric contractions
ability to recoil and resume resting length after stretching
elasticity
ability of muscle cells to be stretched
extensibility
ability to respond to stimuli
excitability
no relaxation before the following contractions
fused tetanus
dark band- the entire length of the thick filament
A band
muscle that opposes or reverses a prime mover
antagonists
ability to shorten when an adequate stimulus is received
contractility
light band- contains only thin filaments
I band
