Muscular System Review
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
