The Muscular System- Histology and Physiology
Structure
and
Function
Physiology of
Skeletal Muscle
Fibers
Contraction of
Whole
Muscles
Muscle
Metabolism
Other Muscle
Types
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FINAL ROUND
Structure and Function of Skeletal Muscle:
$100 Question
Each muscle cell (fiber) is surrounded by
this tissue:
a. perimysium
b. endomysium
c. epimysium
d. sarcolemma
ANSWER
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Structure and Function of Skeletal Muscle:
$100 Answer
Each muscle cell (fiber) is surrounded by
this tissue:
a. perimysium
b. endomysium
c. epimysium
d. sarcolemma
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Structure and Function of Skeletal Muscle:
$200 Question
This statement best describes the muscle
property of extensibility:
a. muscles recoil to original shape
b. muscles shorten forcefully
c. muscles can stretch when needed
d. muscles contract when stimulated
ANSWER
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Structure and Function of Skeletal Muscle:
$200 Answer
This statement best describes the muscle
property of extensibility:
a. muscles recoil to original shape
b. muscles shorten forcefully
c. muscles can stretch when needed
d. muscles contract when stimulated
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Structure and Function of Skeletal Muscle:
$300 Question
Troponin binds to this:
a. G actin
b. calcium ions
c. tropomyosin
d. all of these
e. a and c only
ANSWER
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Structure and Function of Skeletal Muscle:
$300 Answer
Troponin binds to this:
a. G actin
b. calcium ions
c. tropomyosin
d. all of these
e. a and c only
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Structure and Function of Skeletal Muscle:
$400 Question
During muscle contraction, this region
shortens:
a. A band
b. I band
c. H zone
d. both a and b
e. both b and c
ANSWER
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Structure and Function of Skeletal Muscle:
$400 Answer
During muscle contraction, this region
shortens:
a. A band
b. I band
c. H zone
d. both a and b
e. both b and c
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Structure and Function of Skeletal Muscle:
$500 Question
These statements about myosin
myofilaments are all true except:
a. are thicker than actin
b. make up the H zone
c. attached to the Z disc
d. attached to filaments that form the M
line
ANSWER
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Structure and Function of Skeletal Muscle:
$500 Answer
These statements about myosin
myofilaments are all true except:
a. are thicker than actin
b. make up the H zone
c. attached to the Z disc
d. attached to filaments that form the M
line
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Physiology of Skeletal Muscle Fibers:
$100 Question
The resting membrane potential occurs
when:
a. Na+ ions diffuse into the cell
b. Na+ ions diffuse out of the cell
c. K+ ions diffuse into the cell
d. K+ ions diffuse out of the cell
ANSWER
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Physiology of Skeletal Muscle Fibers:
$100 Answer
The resting membrane potential occurs
when:
a. Na+ ions diffuse into the cell
b. Na+ ions diffuse out of the cell
c. K+ ions diffuse into the cell
d. K+ ions diffuse out of the cell
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Physiology of Skeletal Muscle Fibers:
$200 Question
Depolarization must reach this value in a
cell to trigger an action potential:
a. 0 mv
b. +20 mv
c. -85 mv
d. threshold
ANSWER
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Physiology of Skeletal Muscle Fibers:
$200 Answer
Depolarization must reach this value in a
cell to trigger an action potential:
a. 0 mv
b. +20 mv
c. -85 mv
d. threshold
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Physiology of Skeletal Muscle Fibers:
$300 Question
Energy is needed to make muscles
contract and relax.
True/False
ANSWER
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Physiology of Skeletal Muscle Fibers:
$300 Answer
Energy is needed to make muscles
contract and relax.
True/False
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Physiology of Skeletal Muscle Fibers:
$400 Question
These events occur during contraction
except:
a. exposure of active sites on actin
b. active transport of Ca+ back into
sarcoplasmic reticulum
c. cross-bridges are formed and
released
d. power stroke
ANSWER
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Physiology of Skeletal Muscle Fibers:
$400 Answer
These events occur during contraction
except:
a. exposure of active sites on actin
b. active transport of Ca+ back into
sarcoplasmic reticulum
c. cross-bridges are formed and
released
d. power stroke
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Physiology of Skeletal Muscle Fibers:
$500 Question
List the events occurring at a neuromuscular
junction in order.
1. ACh binds to receptors on postsynaptic
membrane
2. acetylcholinesterase breaks down ACh
3. choline is reabsorbed by presynaptic
membrane
4. depolarization of sarcolemma
5. ligand-gated Na+ ion channels open
a. 1,5,4,2,3
c. 1,4,2,3,5
ANSWER
b. 5,3,2,1,4
d. 1,5,2,3,4
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Physiology of Skeletal Muscle Fibers:
$500 Answer
List the events occurring at a neuromuscular
junction in order.
1. ACh binds to receptors on postsynaptic
membrane
2. acetylcholinesterase breaks down ACh
3. choline is reabsorbed by presynaptic
membrane
4. depolarization of sarcolemma
5. ligand-gated Na+ ion channels open
a. 1,5,4,2,3
c. 1,4,2,3,5
b. 5,3,2,1,4
d. 1,5,2,3,4
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Contraction of Whole Muscle:
$100 Question
This stimulus results in the greatest force
of contraction because all motor units of a
muscle are responding:
a. threshold
b. subthreshold
c. maximal
d. supramaximal
ANSWER
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Contraction of Whole Muscle:
$100 Answer
This stimulus results in the greatest force
of contraction because all motor units of a
muscle are responding:
a. threshold
b. subthreshold
c. maximal
d. supramaximal
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Contraction of Whole Muscle:
$200 Question
This kind of contraction results in an
increase of tension, but the length of the
muscle does not change:
a. isometric
b. isotonic
c. concentric
d. eccentric
ANSWER
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Contraction of Whole Muscle:
$200 Answer
This kind of contraction results in an
increase of tension, but the length of the
muscle does not change:
a. isometric
b. isotonic
c. concentric
d. eccentric
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Contraction of Whole Muscle:
$300 Question
Incomplete tetanus occurs when action
potentials are produced so rapidly that the
muscle completely contracts without any
relaxation.
True/False
ANSWER
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Contraction of Whole Muscle:
$300 Answer
Incomplete tetanus occurs when action
potentials are produced so rapidly that the
muscle completely contracts without any
relaxation.
True/False
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Contraction of Whole Muscle:
$400 Question
These conditions occur in both physiologic
contracture and rigor mortis except:
a. low levels of ATP
b. cross-bridges are formed
c. release of cross-bridges
d. Ca2+ builds up in the sarcoplasm
e. active transport of Ca2+ slows or
stops
ANSWER
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Contraction of Whole Muscle:
$400 Answer
These conditions occur in both physiologic
contracture and rigor mortis except:
a. low levels of ATP
b. cross-bridges are formed
c. release of cross-bridges
d. Ca2+ builds up in the sarcoplasm
e. active transport of Ca2+ slows or
stops
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Contraction of Whole Muscle:
$500 Question
Given the following:
1. Ca2+ ions are actively transported
back into sarcoplasmic reticulum
2. Troponin-tropomyosin complexes
move to inhibit cross-bridge formation
3. Muscle fibers lengthen passively
These events best describe:
a. treppe
c. contraction phase
b. lag phase
d. relaxation phase
ANSWER
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Contraction of Whole Muscle:
$500 Answer
Given the following:
1. Ca2+ ions are actively transported
back into sarcoplasmic reticulum
2. Troponin-tropomyosin complexes
move to inhibit cross-bridge formation
3. Muscle fibers lengthen passively
These events best describe:
a. treppe
c. contraction phase
b. lag phase
d. relaxation phase
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Muscle Metabolism:
$100 Question
Because large amounts of ATP are stored
in muscle fibers, it does not need to be
continuously synthesized in order to
sustain muscle contractions.
True/False
ANSWER
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Muscle Metabolism:
$100 Answer
Because large amounts of ATP are stored
in muscle fibers, it does not need to be
continuously synthesized in order to
sustain muscle contractions.
True/False
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Muscle Metabolism:
$200 Question
These statements about creatine phosphate
are true except:
a. accumulates in cells to store energy
b. ADP reacts with it to produce ATP
c. creatine kinase is used as a catalyst
d. supports intense exercise for up to 3
minutes
ANSWER
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Muscle Metabolism:
$200 Answer
These statements about creatine phosphate
are true except:
a. accumulates in cells to store energy
b. ADP reacts with it to produce ATP
c. creatine kinase is used as a catalyst
d. supports intense exercise for up to 3
minutes
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Muscle Metabolism:
$300 Question
Recovery consumption is used to restore
homeostasis after the following:
a. increase in body temperature
b. changes in intracellular ion
concentrations
c. changes in extracellular ion
concentrations
d. changes in hormone levels
e. all of these
ANSWER
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Muscle Metabolism:
$300 Answer
Recovery consumption is used to restore
homeostasis after the following:
a. increase in body temperature
b. changes in intracellular ion
concentrations
c. changes in extracellular ion
concentrations
d. changes in hormone levels
e. all of these
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Muscle Metabolism:
$400 Question
Johnny’s primary source of energy comes
from this as he runs on his treadmill for 30
minutes every morning:
a. stored ATP
b. aerobic respiration
c. anaerobic respiration
d. creatine phosphate
ANSWER
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Muscle Metabolism:
$400 Answer
Johnny’s primary source of energy comes
from this as he runs on his treadmill for 30
minutes every morning:
a. stored ATP
b. aerobic respiration
c. anaerobic respiration
d. creatine phosphate
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Muscle Metabolism:
$500 Question
This statement is true about anaerobic
respiration:
a. produces 38 ATPs per glucose
molecule
b. uses fatty acids for sustained
exercise
c. can produce ATP rapidly
d. uses citric acid cycle
ANSWER
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Muscle Metabolism:
$500 Answer
This statement is true about anaerobic
respiration:
a. produces 38 ATPs per glucose
molecule
b. uses fatty acids for sustained
exercise
c. can produce ATP rapidly
d. uses citric acid cycle
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Other Muscle Types:
$100 Question
These structural characteristics apply to
cardiac muscle:
a. single, centrally located nucleus
b. spindle shaped
c. striated
d. gap junctions hold cells to one
another
e. a and c
ANSWER
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Other Muscle Types:
$100 Answer
These structural characteristics apply to
cardiac muscle:
a. single, centrally located nucleus
b. spindle shaped
c. striated
d. gap junctions hold cells to one
another
e. a and c
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Other Muscle Types:
$200 Question
The depolarization of cardiac muscle
results from the influx of both Na+ and
Ca2+ across the plasma membrane.
True/False
ANSWER
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Other Muscle Types:
$200 Answer
The depolarization of cardiac muscle
results from the influx of both Na+ and
Ca2+ across the plasma membrane.
True/False
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Other Muscle Types:
$300 Question
These are all properties of smooth muscle
except:
a. contracts when stretched
b. autorhythmic
c. responds in all-or-none fashion to
action potentials
d. exhibits relatively constant tension
ANSWER
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Other Muscle Types:
$300 Answer
These are all properties of smooth muscle
except:
a. contracts when stretched
b. autorhythmic
c. responds in all-or-none fashion to
action potentials
d. exhibits relatively constant tension
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Other Muscle Types:
$400 Question
These are the most important
neurotransmitters that regulate smooth
muscle:
a. acetylcholine
b. norepinephrine
c. dopamine
d. epinephrine
e. a and b
ANSWER
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Other Muscle Types:
$400 Answer
These are the most important
neurotransmitters that regulate smooth
muscle:
a. acetylcholine
b. norepinephrine
c. dopamine
d. epinephrine
e. a and b
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Other Muscle Types:
$500 Question
Waves of contraction traverse an entire
sheet of visceral (unitary) smooth muscle
due to the numerous gap junctions that
allow action potentials to pass directly
from cell to cell.
True/False
ANSWER
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Other Muscle Types:
$500 Answer
Waves of contraction traverse an entire
sheet of visceral (unitary) smooth muscle
due to the numerous gap junctions that
allow action potentials to pass directly
from cell to cell.
True/False
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FINAL ROUND Question
This condition would be found within the
leg muscle cells of a good sprinter:
a. myoglobin-rich
b. contract more slowly
c. large deposits of glycogen
d. primarily aerobic
e. numerous mitochondria
ANSWER
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FINAL ROUND Answer
This condition would be found within the
leg muscle cells of a good sprinter:
a. myoglobin-rich
b. contract more slowly
c. large deposits of glycogen
d. primarily aerobic
e. numerous mitochondria
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