NPB101 Exam Questions and Answers
Graded A+
How are muscle categorized according to structure - Correct answer-Striated
unstriated
how are muscles categorized according to control - Correct answer-voluntary and
involuntary
three types of muscles - Correct answer-cardiac smooth and skeletal
Classification of skeletal muscle - Correct answer-striated and voluntary
description of skeletal muscles - Correct answer-bundles of long thick cylindrical,
striated, contractile, multinucleate cells that extend to the lenght of the muscle
location of skeletal muscle - Correct answer-attached to bones of skeleton
function of skeletal muscle - Correct answer-movement of body in relation to
external environment
classification of cardiac muscle - Correct answer-striated, involuntary
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,description of cardiac muscle - Correct answer-interlinked network of short slender
cylindrical striated branded contractile cells connected cell to cell by intercalated
discs
location of cardiac muscle - Correct answer-wall of heart
function of cardiac muscle - Correct answer-pumping blood out of the heart
classification of smooth muscle - Correct answer-unstriated muscles involuntary
description of smooth muscle - Correct answer-loos network of short, slender,
spindle shaped, unstriated, contractile cells that are arranged in sheets
typical location of smooth muscle - Correct answer-walls of hollow organs and
tubes
skeletal muscle fibres - Correct answer-striated by a highly organized internal
arrangement
muscle fibers lie parallel to one another
what composes a muscle fibre - Correct answer-myofibrils
myofibril - Correct answer-made of a regular arrangement of thick and thin
filaments
A band - Correct answer-the thick filament
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,m line - Correct answer-line in the middle of the sarcomere
z line - Correct answer-separates the sarcomeres
i band - Correct answer-from thick filament to the next with the z line in the middle
Thick filament - Correct answer-myosin
thin filament - Correct answer-actin
H zone - Correct answer-the area where threes just thick filament and no thin -
contains the m line
what holds the thick filament in place - Correct answer-titian
titin - Correct answer-eastic protein that holds myosin in place
what zones get smaller in a myofibril - Correct answer-H band
sarcomere - Z band
I band
what band/s stay the same in a myofibril - Correct answer-A band
rein components of thick and thin filaments - Correct answer-thick - myosin
thin - actin
myosin - Correct answer-thick filaments
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, protein consisting of two identical subunits each shaped like a club
actin - Correct answer-main structural component of thin filaments
interacts with myosin crossbridges
tropomyosin and troponin lie across the surface of actin
What happens during contraction of skeletal muscle - Correct answer-bicycles of
cross bridge binding and bending pull thin filaments inward
sliding filament mechanisms = contraction
it uses a power stroke
how is contraction accomplished - Correct answer-thin filaments from the opposite
sides of the sarcomere slide closer together between the thick filaments
power stroke - Correct answer-stroking motion that pulls the thin filament towards
the center of the sarcomere
two sites on myosin - Correct answer-actin binding site
myosin ATPase site
troponin - Correct answer-binds to Ca that come in from lateral sacs
it then moves the tropomyosin away from the actin so that myosin head can bind
instead
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Graded A+
How are muscle categorized according to structure - Correct answer-Striated
unstriated
how are muscles categorized according to control - Correct answer-voluntary and
involuntary
three types of muscles - Correct answer-cardiac smooth and skeletal
Classification of skeletal muscle - Correct answer-striated and voluntary
description of skeletal muscles - Correct answer-bundles of long thick cylindrical,
striated, contractile, multinucleate cells that extend to the lenght of the muscle
location of skeletal muscle - Correct answer-attached to bones of skeleton
function of skeletal muscle - Correct answer-movement of body in relation to
external environment
classification of cardiac muscle - Correct answer-striated, involuntary
©COPYRIGHT 2025, ALL RIGHTS RESERVED 1
,description of cardiac muscle - Correct answer-interlinked network of short slender
cylindrical striated branded contractile cells connected cell to cell by intercalated
discs
location of cardiac muscle - Correct answer-wall of heart
function of cardiac muscle - Correct answer-pumping blood out of the heart
classification of smooth muscle - Correct answer-unstriated muscles involuntary
description of smooth muscle - Correct answer-loos network of short, slender,
spindle shaped, unstriated, contractile cells that are arranged in sheets
typical location of smooth muscle - Correct answer-walls of hollow organs and
tubes
skeletal muscle fibres - Correct answer-striated by a highly organized internal
arrangement
muscle fibers lie parallel to one another
what composes a muscle fibre - Correct answer-myofibrils
myofibril - Correct answer-made of a regular arrangement of thick and thin
filaments
A band - Correct answer-the thick filament
©COPYRIGHT 2025, ALL RIGHTS RESERVED 2
,m line - Correct answer-line in the middle of the sarcomere
z line - Correct answer-separates the sarcomeres
i band - Correct answer-from thick filament to the next with the z line in the middle
Thick filament - Correct answer-myosin
thin filament - Correct answer-actin
H zone - Correct answer-the area where threes just thick filament and no thin -
contains the m line
what holds the thick filament in place - Correct answer-titian
titin - Correct answer-eastic protein that holds myosin in place
what zones get smaller in a myofibril - Correct answer-H band
sarcomere - Z band
I band
what band/s stay the same in a myofibril - Correct answer-A band
rein components of thick and thin filaments - Correct answer-thick - myosin
thin - actin
myosin - Correct answer-thick filaments
©COPYRIGHT 2025, ALL RIGHTS RESERVED 3
, protein consisting of two identical subunits each shaped like a club
actin - Correct answer-main structural component of thin filaments
interacts with myosin crossbridges
tropomyosin and troponin lie across the surface of actin
What happens during contraction of skeletal muscle - Correct answer-bicycles of
cross bridge binding and bending pull thin filaments inward
sliding filament mechanisms = contraction
it uses a power stroke
how is contraction accomplished - Correct answer-thin filaments from the opposite
sides of the sarcomere slide closer together between the thick filaments
power stroke - Correct answer-stroking motion that pulls the thin filament towards
the center of the sarcomere
two sites on myosin - Correct answer-actin binding site
myosin ATPase site
troponin - Correct answer-binds to Ca that come in from lateral sacs
it then moves the tropomyosin away from the actin so that myosin head can bind
instead
©COPYRIGHT 2025, ALL RIGHTS RESERVED 4
