What structure is the functional unit of contraction in a skeletal muscle fiber? The junctional folds of the sarcolemma The sarcomere The cross bridge The triad

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What structure is the functional unit of contraction in a skeletal muscle fiber?
The junctional folds of the sarcolemma
The sarcomere
The cross bridge
The triad

 
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The cross bridge cycle is a series of molecular events that occur after excitation of the sarcolemma. What is a cross bridge? ATP bound to a myosin head Calcium bound to troponin Troponin bound to tropomyosin A myosin head bound to actin

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The cross bridge cycle is a series of molecular events that occur after excitation of the sarcolemma. What is a cross bridge?
ATP bound to a myosin head
Calcium bound to troponin
Troponin bound to tropomyosin
A myosin head bound to actin

 
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Which of the following is most directly responsible for the coupling of excitation to contraction of skeletal muscle fibers? Acetylcholine. Calcium ions. Sodium ions. Action potentials.

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Which of the following is most directly responsible for the coupling of excitation to contraction of skeletal muscle fibers?
Acetylcholine.
Calcium ions.
Sodium ions.
Action potentials.

 
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A triad is composed of a T-tubule and two adjacent terminal cisternae of the sarcoplasmic reticulum. How are these components connected? Potassium leak channels. A series of proteins that control calcium release. Voltage-gated sodium channels. Myosin cross-bridge binding sites.

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A triad is composed of a T-tubule and two adjacent terminal cisternae of the sarcoplasmic reticulum. How are these components connected?
Potassium leak channels.
A series of proteins that control calcium release.
Voltage-gated sodium channels.
Myosin cross-bridge binding sites.

 
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