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Exam 9: The Muscular System: Skeletal Muscle Tissue and Muscle Organization

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Question 31

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Why does a person with muscles that have a higher percentage of slow fibers have greater endurance than a person with muscles that have a lower percentage of slow fibers?

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A person with more slow fibers in a part...

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Question 32

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The sliding mechanism of myofilaments works when ________.

A) the thick filaments detach from the muscle tendon
B) the myosin heads of the thick filaments bind to active sites on the actin molecules of the thin filaments
C) the myosin heads pivot away from the M line toward the Z lines
D) the troponin-tropomyosin complex interacts with the actin molecules
E) calcium ions bind to active sites on the actin molecules of the thin filaments

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Question 33

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Figure 9.3 Using the diagrams depicting different views of the neuromuscular synapse, identify the specified labeled part in each of the following questions. -Identify the specific structure indicated by Label Q.

Two factors that are used to determine the classification of a skeletal muscle are (1) the arrangement of the muscle fibers. (2) the structural arrangement relative to the direction of the pull. (3) the overall size of the muscle. (4) the amount of connective tissue present within the muscle. (5) the number of tendons connected to the muscle.

While wearing a cast due to a broken bone, muscles shrink due to the process of ________.

Actinin molecules form an open meshwork at the ________.

Figure 9.1 Using the diagrams of the structural organization of skeletal muscle, identify the specified labeled part in each of the following questions. -Identify the specific structure indicated by Label S.

Which of the following events occurs first?

When viewed under polarized light, the dark staining bands are the A bands.

An intermediate fiber contracts fast, but it has more ________ and greater resistance to fatigue than a fast fiber.

Figure 9.4 Using the above-referenced figures depicting skeletal muscle fiber organization, identify the specific labeled part indicated in each of the following questions. -Identify the specific structure indicated by Label B.

The biceps brachii is an example of a muscle with its fascicle oriented in a ________ fashion.

Figure 9.2 Using the diagram of a sarcomere, identify the specified labeled part in each of the following questions. -Identify the specific structure indicated by Label A.

What symptoms accompany fibromyalgia?

Skeletal muscle fibers arise from embryonic cells called ________.

Slow twitch fibers appear red due to the intracellular storage of ________.

Figure 9.1 Using the diagrams of the structural organization of skeletal muscle, identify the specified labeled part in each of the following questions. -Identify the specific structure indicated by Label X.

When a single motor neuron controls a greater number of muscle fibers in a motor unit, ________.

Figure 9.2 Using the diagram of a sarcomere, identify the specified labeled part in each of the following questions. -Identify the specific structure indicated by Label E.

The expanded portion of the axonal branch that faces a region of the sarcolemma is called an axon terminal.