Muscular System

25 terms by Paranoid 

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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 _______

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