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25 terms

Muscular System

STUDY
PLAY
calcium ions
Serves as the actual "go" signal for muscle contraction
ACh
neurotransmitter substance released at motor end plates by the motor neuron
calcium ions
Normally stored in the sarcoplasmic reticulum
aerobic respiration
A metabolic pathway that produces water, carbon dioxide, and ATP, and provides for a large amount of ATP per glucose because oxygen is used
creatine phosphate
A reserve, high-energy compound used to convert ADP to ATP by the tranfer of a high-energy phosphate group
enzymes
Destroys ACh
synaptic cleft
The gap between the motor neuron and the muscle fiber it supplies is called the
actin
The sliding filament theory of muscle contraction involves sliding of the
ATP
The only energy source that can be used to directly power muscle activity
tetanic contraction
A smooth, sustained contration is called
insertion
The end of the muscle that moves when a muscle contracts is called the
circumduction
The movement that is commonly seen in a ball-in-socket joint is
flexion
Movement that decreases the angle between two bones; bending the knee
abduction
Movement along the frontal plane, away from the body midline; raising the arm laterally.
rotation
Circular movement around the longitudinal bone axis; shaking the head "no."
circumduction
Describing a cone-shaped pathway with the arm.
Supination
Moving the hand into a palm-up (or forward) position
Dorsiflexion
Movement of the superior aspect of the foot toward the leg; standing on one's heels.
Inversion
Turning the sole of the foot medially
skeletal
Only ______ muscle cells are multinucleated
skeletal
The muscle tissue that is normally arrhythmic is ______ muscle
cardiac
Only ______ muscle cells branch
tendons
Muscle is often attached to bone b strong, cordlike structures called _______
H
The ___ zone of a sarcomere contains no actin
Cross-bridges
The heads of the myosin myofilaments are called _______