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Exam 10: Muscle Tissue

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Question 71

Multiple Choice

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The repolarization of the action potential involves the opening of

A) chemically gated Na⁺ channels.
B) voltage-gated Na⁺ channels.
C) chemically gated K⁺ channels.
D) voltage-gated K⁺ channels.

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Question 72

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Each thick filament contains about ________ protein molecules (each molecule has two heads and two braided tails) .

A) 2
B) 20
C) 200
D) 2000

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Question 73

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The metabolic reactions within fast-twitch fibers derive much of their energy from aerobic respiration.

Slow-twitch fibers are specialized to continue contracting for extended periods of time without experiencing fatigue.

For a sprint lasting 60 seconds, ATP is supplied primarily by

Muscles of the eye and hand have a high percentage of ________ fibers.

A sarcomere is defined as the distance from one ________ to the next adjacent ________. (The same answer fills in both spaces.)

The fat and connective tissue that encircle a beef steak form the endomysium.

________ is a protein that anchors myofibrils that are adjacent to the sarcolemma to proteins in the sarcolemma.

A continuous, smooth contraction of muscle in which twitches are fully fused is referred to as ________.

The top long-distance runners probably have ________ proportion of slow muscle fibers in their leg muscles.

With increased age, skeletal muscles show

The functional contractile unit of a skeletal muscle fiber is called a ________.

The type of muscle fibers that are striated, form Y-shaped branches, and are joined by intercalated discs are

Acetylcholine exerts its effect by

Which letter is associated with the line that is a thin protein structure that serves as an attachment site for thin filament ends?

A reduced ability to generate tension due to recent exertion of force is known as muscle ________.

A skeletal muscle cell contains hundreds to thousands of ________, which are complex organelles; they are cylindrical in shape-about 2 micrometers in diameter and as long as the cell.

Which type of smooth muscle is innervated most similar to skeletal muscle, with muscle cells arranged as motor units and each cell stimulated by a single motor neuron?

A graph of a muscle twitch contains three periods. The period during which there is no change in external muscle tension (and no change in muscle length) is the ________ period.