Anatomy - Skeletal Muscle Review
Which of the following muscles is named for its shape?
Deltoid
A resting muscle generates most of its ATP by
Aerobic respiration
The specialized sarcolemma that contains acetylcholine receptors is the
Motor end plate
Neurotransmitters that cause skeletal muscle contraction are normally stored in
Motor neuron axon terminals
Which statement regarding "heat loss" is true?
Muscle contractions play an important role in the maintenance of normal body temperature
Exhaustion of energy reserves or decline in pH due to production and dissociation of lactic acid causes
Muscle fatigue
The skeletal muscle structures that actively shorten and are responsible for muscle fiber contraction are called
Myofibrils
The striated appearance of skeletal muscle results from
The actin and myosin arrangement
The muscle that dorsiflexes the foot is the
Tibialis anterior
Which muscles extends the elbow during the action of push-ups?
Triceps brachii
During active-site exposure, calcium ions bind to which of the following?
Troponin
Tropomyosin strands are held in position by which of the following?
Troponin molecules
Muscle fascicles are separated by
Perimysium
Rigor mortis occurs at death due to a lack of
ATP
The deltoid acts to
Abduct the arm
Which of the following is one of the steps that ends a contraction?
Acetylcholine is broken down by acetylcholinesterase
The ________ contains vesicles filled with acetylcholine.
Axon terminal
In infants, which muscle produces suction for suckling at the breast?
Buccinator
The muscle that compresses the cheeks, as when pursing the lips and blowing forcefully, is the
Buccinator
Muscle cells
Can only contract
Active muscles generate
Carbon dioxide and heat
Which of the following describes the action of the trapezius?
Elevates, adducts, depresses, or rotates the scapula
A sheath of connective tissue surrounding a bundle of striated muscle fibers is called
Endomysium
A layer of collagen fibers that surrounds an entire muscle is called
Epimysium
Which of the following muscles acts to flex the finger joints and wrist?
Flexor digitorum
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 area of the sarcomere that is the light regions 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 thick filament to its neighbors?
M line
Which of the following is a muscle that originates from the zygomatic arch and functions in elevating the mandible?
Masseter
Which of the following is true about red muscles?
Red muscles are slower than white muscles
Which of the following is an accurate characteristic of slow fibers?
Resting slow muscle fibers contain oxygen reserves
The area between Z lines is the
Sarcomere
The skeletal muscles store calcium ions in the terminal cisternae of the
Sarcoplasmic reticulum
Which of the following statements describes how muscles help maintain homeostasis?
Skeletal muscle contractions help maintain body temperature
Acetylcholinesterase is found within the
Synaptic cleft
Regarding a skeletal muscle fiber, wherever a T-tubule encircles a myofibril, the tubule is tightly bound to
The sarcoplasmic reticulum
Myofibrils are made primarily of
Actin and myosin
When a calcium ions binds troponin
Active sites on actin exposed
A muscle ________ contains a sarcolemma, sarcoplasm, myofilaments, and myofibrils.
Fiber
Muscles whose names contain the root cervi- would be found in the
Neck
The less-movable end of the skeletal muscle is the
Origin
Which statement regarding skeletal muscle is true?
Skeletal muscles contain blood vessels
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