Unit 03 Exam Review A- Skeletal Muscle Question Preview (ID: 37231)
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muscle cells have a single action, they
a) contract, shortening in length
b) expand, increasing in length
c) stretch, increasing in length
d) contract, increasing in strength
a muscle that constricts an opening is a(n)
a) sphincter
b) extensor
c) obdurator
d) antagonist
the perimysium surrounds
a) a bundle of muscle fibers known as a fascicle
b) a bundle of fascicles known as a muscle body
c) a bundle of myofibers known as a myofibril
d) an individual muscle fiber
the special area of the sarcolemma at the neuromuscular junction is called the
a) motor end plate
b) motor middle spoon
c) motor beginning fork
d) the neuromyofloccular junction
quantal summation increases contraction strength by
a) recruiting additional motor units
b) increasing the duration of each muscle twitch
c) increasing the number of muscle twitches per unit time
d) increasing the contractile distance of each sarcomere along the muscle fiber
somatic motor neurons release the NT at the neuromuscular junction
a) acetylcholine
b) dopamine
c) norepinephrine
d) serotonin
each somatic motor neuron innervates a group of muscle fibers called a
a) motor unit
b) muscle pool
c) fascicle set
d) myobundle
muscle filaments come in two 'flavors'
a) thick, made of myosin; and thin, made of actin
b) thick, made of actin and thin, made of myosin
c) thick, made of troponin; and thin, made of tropomyosin
d) polar, positively charged ions; and non-polar, which have no charge
the functionally 'contractile' unit of a skeletal muscle fiber is a structure called the
a) sarcomere
b) myofibril
c) sarcolemma
d) sarcoplasmic reticulum
during muscle contraction, the
a) Z bands get closer together
b) the A band changes in size
c) the M line moves laterally
d) the H band thickens
myosin 'heads' bind to _______, forming _______
a) actin, cross-bridges
b) sarcomeres, fascicles
c) troponin, linkages
d) tropomyosin, Z-bands
the myosin heads are released by the binding of
a) ATP
b) actin
c) troponin
d) calcium ions
actin and myosin cannot bind until the blocking effect of ___ is removed
a) tropomyosin
b) tropactin
c) troponin
d) ADP
in the absence of ATP in the muscle, ____ sets in
a) rigor mortis
b) tetanus
c) treppe
d) atrophy
for muscle contraction to cease, ___ must be actively pumped into the _________
a) calcium; sarcoplamsic reticulum
b) troponin, actin potential
c) Sodium, transverse tublues
d) Potassium, sarcoplasm
the movement of the troponin-tropomyosin complex requires
a) Calcium Ions
b) ATP
c) Sodium Ions
d) acetylcholine
during muscle contraction, calcium release channels, to nobody's surprise, release calcium via a process called
a) facilitated diffusion
b) active transport
c) endocytosis
d) exocytosis
action potentials are conducted from the motor end plate through ___ into the interior of the muscle fiber
a) T tubules
b) Sarcoplasmic Reticulum
c) Myofibrils
d) Ryanodine receptors
what role(s) does ATP play in muscle contraction and relaxation?
a) all of the rest apply
b) is causes the myosin head to detach from actin
c) it powers the calcium ion pump to return calcium to the endoplasmic reticulum
d) it returns the myosin head to its 'active' state, ready to cross-bridge to actin
the inability of muscle cells to relax due to high frequency stimulation is
a) tetanus
b) treppe
c) twich
d) recruitment
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