Podcast
Questions and Answers
During muscle contraction, the I band and H zone __________
During muscle contraction, the I band and H zone __________
shorten
According to the sliding-filament model of muscle contraction, the thick and thin filaments do not change ________ when the sarcomere shortens
According to the sliding-filament model of muscle contraction, the thick and thin filaments do not change ________ when the sarcomere shortens
length
The region occupied only by the actin is known as the _______ bands
The region occupied only by the actin is known as the _______ bands
I
The broad region that corresponds to the length of the thick filaments is known as the ______ band
The broad region that corresponds to the length of the thick filaments is known as the ______ band
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The mechanism that produces the motion by which actin and myosin slide over one another is called the ________ cycle
The mechanism that produces the motion by which actin and myosin slide over one another is called the ________ cycle
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The ______ helps anchor the thick myosin filament to the Z-line at the end of the sarcomere.
The ______ helps anchor the thick myosin filament to the Z-line at the end of the sarcomere.
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______ is highly elastic and helps give the muscle the ability to stretch and recoil.
______ is highly elastic and helps give the muscle the ability to stretch and recoil.
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The sarcoplasmic reticulum functions primarily in the storage of ______ ions, which are released upon stimulation by electrical signals.
The sarcoplasmic reticulum functions primarily in the storage of ______ ions, which are released upon stimulation by electrical signals.
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Calcium triggers a muscle contraction by binding to ______, which causes a conformational change in tropomyosin.
Calcium triggers a muscle contraction by binding to ______, which causes a conformational change in tropomyosin.
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______: Distinguishing among terms like sarcomere, myofibril, myofilament, and myofiber is important.
______: Distinguishing among terms like sarcomere, myofibril, myofilament, and myofiber is important.
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Myofibrils are made up of three different classes of proteins: Contractile proteins, _______ proteins, and regulatory proteins.
Myofibrils are made up of three different classes of proteins: Contractile proteins, _______ proteins, and regulatory proteins.
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According to the EXAM TIP, don't confuse myofibrils (which are ________) with myofibers (which are entire muscle cells).
According to the EXAM TIP, don't confuse myofibrils (which are ________) with myofibers (which are entire muscle cells).
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The mechanism that produces the motion by which actin and myosin slide over one another is called the ________ cycle.
The mechanism that produces the motion by which actin and myosin slide over one another is called the ________ cycle.
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During muscle contraction, the I band and H zone __________.
During muscle contraction, the I band and H zone __________.
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The broad region that corresponds to the length of the thick filaments is known as the ______ band.
The broad region that corresponds to the length of the thick filaments is known as the ______ band.
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The ______ is a deep invagination of the sarcolemma into the cell's interior, weaving around and between the myofibrils.
The ______ is a deep invagination of the sarcolemma into the cell's interior, weaving around and between the myofibrils.
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______ are enlarged areas of the sarcoplasmic reticulum that lie adjacent to the T-tubule, storing and releasing calcium in response to an action potential.
______ are enlarged areas of the sarcoplasmic reticulum that lie adjacent to the T-tubule, storing and releasing calcium in response to an action potential.
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A ______ is formed by a T-tubule plus the two adjacent terminal cisternae, typically found at the A-I junction.
A ______ is formed by a T-tubule plus the two adjacent terminal cisternae, typically found at the A-I junction.
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The ______ model of muscle contraction explains the process of skeletal muscle contraction.
The ______ model of muscle contraction explains the process of skeletal muscle contraction.
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[Exam tip]: The triads dispersed throughout the entire length of the muscle fiber ensure even distribution of ______ in response to an action potential.
[Exam tip]: The triads dispersed throughout the entire length of the muscle fiber ensure even distribution of ______ in response to an action potential.
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Skeletal muscles are unique in the body because they are long, with multiple ________
Skeletal muscles are unique in the body because they are long, with multiple ________
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Tendons are bands of connective tissue responsible for transmitting the force produced by the muscle to the ________
Tendons are bands of connective tissue responsible for transmitting the force produced by the muscle to the ________
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Muscles consist of many fascicles (bundles) of individual muscle cells, also referred to as muscle fibers or ________
Muscles consist of many fascicles (bundles) of individual muscle cells, also referred to as muscle fibers or ________
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Muscles are organs because they consist of multiple tissue types, including skeletal muscle tissue, connective tissue, blood vessels, and ________
Muscles are organs because they consist of multiple tissue types, including skeletal muscle tissue, connective tissue, blood vessels, and ________
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The broad region that corresponds to the length of the thick filaments in a sarcomere is known as the ________ band
The broad region that corresponds to the length of the thick filaments in a sarcomere is known as the ________ band
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