Muscular system review 2

contractions in which muscles shorten and produce movement are known as

• isotonic contractions

• twitches

• isometric contractions

• resistance exercises

The point of muscle attachment to an immovable or less movable bone as the

• innervation

• action

• insertion

• origin

Muscles that perform opposite actions to one another are termed

• synergists

• prime movers

• antagonists

• fixators

The arrangement of fascicles in orbicularis oris is

• circular

• convergent

• pennate

• fusiform

The prime mover of the arm abduction is the ______ muscle.

• trapezius

• deltoid

• triceps brachii

• biceps brachii

Jason injured his hamstring muscle group during football practice. He will be unable to perform _______.

• thigh extension and knee flexion

• dorsiflexion

• thigh abduction and adduction

• leg rotation and plantar flexion

An inherited disease that causes muscles to degenerate and atrophy is known as ____________.

• torticollis

• muscular dystrophy

• cystic fibrosis

• myasthenia gravis

Striated involuntary muscle tissue found in the heart is ___________.

• smooth muscle

• skeletal muscle

• dense regular

• cardiac muscle

• dense irregular

What is covered by the endomysium?

• fascicles of muscle cells

• an entire muscle

• an individual muscle cell

• myofibrils

• smooth muscle only

What created the alternating light and dark bands that provides the striation pattern on skeletal muscle tissue?

• sarcoplasm and sarcolemma

• thick filaments and myosin heads

• Thick filaments and thin filaments

• Z discs and H zones