Muscular Systems

Elasticity

Term describing the ability of a muscle to resume resting length after stretching

Excitability

Term describing the ability of a muscle to receive and respond to a stimulus (Responsiveness or irritability)

Contractility

Term describing the ability of a muscle to forcibly shorten when adequate stimulus is recieved

Extensibility

Term describing the ability of a muscle to be stretched

Elasticity

Term describing the ability of a muscle to resume resting length after stretching

Acetylcholine

In muscle cells, the neurotransmitter released by the neuron that binds to receptors on the sarcolemma

Actin

Thin myofilaments

Myosin

Thick myofilaments

Aerobic

Uses oxygen, primary type of respiration for human body functions

Anaerobic

Does not use oxygen, type of respiration for human body functions when oxygen is unavailable

Isotonic contractions

Myofilaments are able to slide past each other during contractions. Muscle Shortens, Movement occurs.

Isotonic

Bending the knee is an ____ contraction

Isometric Contractions

Muscle filaments are trying to slide but the muscle is against an unmovable object. Tension increases but muscles don’t shorten.

Isometric

Pushing against a wall is an ___ contraction

Myo, Mys

The prefixes ____ and ____ refer to muscles

Muscle fiber

A muscle cell is also called a

Fascicle

Bundle of muscle cells

Perimysium

Each fascicle is wrapped in this connective tissue

Epimysium

A muscle is made of of many fascicles wrapped together and surrounded by this connective tissue

Myofibrils

Long organelles inside the cell

Motor Unit

A motor neuron and all the skeletal muscle cells stimulated by that neuron

Myosin

Thick filament with cross bridges

Sarcolemma

Specialized plasma membrane

Actin

Thin filament found in I and A band areas

Neurotransmitter

Chemical released by nerve upon arrival of an impulse

Sarcomere

Contractile unit of muscle fiber