ch 11 pre lab quiz

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Which of the following statements accurately defines sliding filament mechanism?

Mechanism by which muscles contract during which the thick and thin filaments slide past one another

Which of the following statements accurately defines thin filament?

Myofilament composed of the contractile protein actin and the regulatory proteins troponin and tropomyosin

Which of the following statements accurately defines thick filament?

Myofilament composed of the contractile protein myosin

Which of the following statements accurately defines myofibril?

Rodlike bundle of contractile filaments found in muscle fibers

Which of the following statements accurately defines crossbridge cycle?

Series of events during which actin and myosin bind and detach cyclically, resulting in the generation of tension during a contraction

Which of the following statements accurately defines M line?

A line consisting of different proteins that bisects the H zone

Which of the following statements accurately defines sarcoplasmic reticulum?

A modified smooth endoplasmic reticulum that wraps around the myofibrils and stores calcium ions

Which of the following statements accurately defines muscle fiber?

Another term for a muscle cell

Which of the following statements accurately defines perimysium?

Connective tissue sheath surrounding each fascicle

Which of the following statements accurately defines A band?

Dark regions of the striations in skeletal muscle tissue that consist of thick and thin filaments or thick filaments only

Which of the following statements accurately defines epimysium?

A connective tissue sheath covering a whole muscle

Which of the following statements accurately defines action potential?

A rapid series of changes in the membrane potential of the muscle fiber sarcolemma

Which of the following statements accurately defines T-tubule?

An extension of the sarcolemma that dives into the muscle fiber and surrounds myofibrils

Which of the following statements accurately defines excitation-contraction coupling?

Excitation of a muscle fiber by a motor neuron leading to the release of calcium ions from the sarcoplasmic reticulum and the initiation of a contraction

Which of the following statements accurately defines endomysium?

Extracellular matrix surrounding muscle fibers

Which of the following statements accurately defines fascicle?

Group of muscle fibers surrounded by the perimysium

Which of the following statements accurately defines I band?

Light regions of the striations in skeletal muscle tissue that consist of thin filaments only

Which of the following statements accurately defines Z disk?

Line consisting of different proteins that bisects the I band

Which of the following statements accurately defines myofilament?

Long, filamentous protein that constitutes myofibrils

Which of the following statements accurately defines terminal cisternae?

Point at which the sarcoplasmic reticulum swells where it meets a T-tubule

Which of the following statements accurately defines length-tension relationship?

The amount of tension generated by a contraction is influenced by how much the thick and thin filaments overlap when the muscle fiber is at rest

Which of the following statements accurately defines H zone?

The lighter region in the midsection of each A band that consists of thick filaments only

Which of the following statements accurately defines sarcolemma?

The plasma membrane of a skeletal muscle fiber


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