Ch 6 Muscular System Review

What organelle stores calcium?

• cross bridge

• sarcolemma

• sarcoplasmic reticulum

• sarcomere

One neuron and all the skeletal muscles it stimulates is known as a (a)   .

• neuromuscular junction

• sarcoplasmic reticulum

• synaptic cleft

• motor unit

The heads of the myosin myofilaments form (a)   when they link the thick filaments (​ (b)   ) and thin filaments (​ (c)   )together during skeletal muscle contraction.

• cross bridges
• motor units

• synapses

• neuromuscular junctions
• myosin
• actin

The plasma membrane of a skeletal muscle cell is called the (a)   .

• sarcoplasmic reticulum

• myofilament

• sarcoplasm

• sarcolemma

A smooth, sustained contraction, with no evidence of relaxation, is called (a)   .

• summing of contractions

• a twitch

• unfused, or incomplete, tetanus

• fused, or complete, tetanus

Contractions in which muscles shorten and produce movement are known as (a)   .

• twitches

• isometric contractions

• resistance exercises

• isotonic contractions

The point of muscle attachment to an immovable or less movable bone is known as the (a)   .

• innervation

• insertion

• action

• origin

Muscles that perform opposite actions to one another are termed (a)   .

• synergists

• fixators

• antagonists

• prime movers

Which of the following are functions of the muscular system? Select all that apply.

• stabilization of joints

• production of movement

• blood cell formation

• maintenance of posture

• generation of heat

_______ is released by axon terminals into the synaptic cleft to stimulate a muscle to contract.

• actin

• myosin heads

• acetylcholine

• potassium ions

• sodium ions