ch 11 pre lab quiz
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
