Welcome to the Quiz!
This quiz contains 12 questions from a mix of 1 subtopics.
What type of muscle is unique to the heart?
cardiac
involuntary
smooth
skeletal
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Which adaptation helps fast-twitch muscle fibres carry out short bursts of intense activity?
a greater density of mitochondria compared to slow-twitch fibres
an increased concentration of myoglobin over slow-twitch fibres
a large store of phosphocreatine
an extensive network of blood vessels
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List 2 structural adaptations of slow-twitch muscle fibres.
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Which of the following is NOT a key component inside a muscle fibre?
sarcolemma
myofibril
axon
sarcoplasm
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What slides past each other during muscle contraction?
Z-lines
sarcolemma and sarcoplasm
nuclei
actin and myosin filaments
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Where are myosin filaments absent in a sarcomere?
H-zone
A band
I band
M-line
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What does the A band of a sarcomere contain?
both actin and myosin filaments
only myosin filaments
only actin filaments
neither actin nor myosin filaments
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What is the cytoplasm of muscle fibres called?
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Which of the following is responsible for storing and releasing calcium ions in a muscle fibre?
sarcolemma
sarcoplasm
myofibrils
sarcoplasmic reticulum
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What structure marks the boundaries of sarcomeres?
A bands
Z-lines
H-zone
M-line
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What section of a sarcomere contains only myosin filaments?
I bands
H-zone
Z-lines
A bands
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Which main filament in sarcomeres is composed of long rod shapes with bulbous heads?
actin filaments
T tubules
Z-lines
myosin filaments
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