Muscular System Review

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Which of the following muscles is named for its shape?

Deltoid

In infants, which muscle produces suction for suckling at the breast?

buccinator

Muscle cells

can only contract

Active muscles generate __________

carbon dioxide

A muscle __________ contains a sarcolemma, sarcoplasm, myofilaments and myofibrils.

fiber

Which of the following is a muscle that originates from the zygomatic arch and functions in elevating the mandible?

masseter

Neurotransmitters that cause skeletal muscle contraction are normally stored in

motor neuron axon terminals

The less-movable end of a skeletal muscle is the

origin

A sheath of connective tissue surrounding a bundle of striated muscle fibers is called __________

perimysium

Muscle fascicles are separated by

perimysium

Which of the following is an accurate characteristic is slow fibers?

resting slow muscle fibers contain oxygen reserves

The skeletal muscles store calcium ions in the terminal cisternae of the

sarcoplasmic reticulum

The __________ contains vesicles filled with acetylcholine

axon terminal

Rigor mortis occurs at death due to a lack of

ATP

Which of the following is one of the steps that ends a contraction?

Acetylcholine is broken down by acetylcholinestease

The area of the sacromere that is the light region between two successive A-bands is the

I band

Which of the following sarcomere components is made up of proteins that connect the central portions of each each thick filament to its neighbors?

M line

Which statement regarding "heat loss" is true?

Muscle contractions play an important role in the maintenance of normal body temperature

Which of the following is true about red muscles?

Red muscles are slower than white muscles

Which statement regarding skeletal muscle is true?

Skeletal muscles contain blood vessels

The deltiod acts to

abduct the arm

Myofibrils are made primarily of

actin and myosin

The striated appearance of skeletal muscle results from

actin and myosin arrangement

When a calcium ion bind to toponin,

active sites on actin are exposed

Which of the following describes the action of the trapezius?

elevates, adducts, depresses or rotates the scapula

A layer of collagen fibers that surrounds an entire muscle is called

epimysium

Skeletal muscle fibers differ from "typical cells" in that these muscle fibers

have many nuclei

The term used to describe muscular growth in response to usage is

hypertrophy

The skeletal muscle structures that actively shorten and are responsible for muscle fiber contraction are called

myofibrils

Muscles whose names contain the root cervi- would be found in the

neck

A person whose genetic makeup makes him or her a better marathon runner than a sprinter probably has more __________ in his or her leg muscles

slow fibers

Acetycholinesterase is found within the __________

synaptic cleft

The muscle that dorsiflexes the foot is the

tibialis anterior

Tropomyosin strands are held in position by what?

toponin molecules

Which muscle extends the elebow during the action of push-ups?

triceps brachii


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