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9. Muscle Tissue

Structure of a Skeletal Muscle

9. Muscle Tissue

Structure of a Skeletal Muscle

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Organization of Muscle Tissue

Organization of Muscle Tissue

Structure of a Skeletal Muscle Example 1

Structure of a Skeletal Muscle Example 1

The Muscle Fiber

The Muscle Fiber

Structure of a Skeletal Muscle Example 2

Structure of a Skeletal Muscle Example 2

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Skeletal Muscle

Skeletal Muscle

Medic Tutorials - Medicine and Language

Skeletal Muscle - Fibers and Fibrils

Skeletal Muscle - Fibers and Fibrils

Medic Tutorials - Medicine and Language

Skeletal Muscle Tissue

Skeletal Muscle Tissue

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Practice this topic

Multiple Choice

What layer of connective tissue surrounds and separates muscle fibers?

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Multiple Choice

A fascicle is a bundle of:

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Multiple Choice

The plasma membrane of a muscle fiber is called the ____________ and it wraps bundles of ____________.

Has a video solution.

Multiple Choice

True or False: if false, chose the answer that corrects the statement.

The smallest contractile unit of a muscle is the muscle cell.

Has a video solution.

Multiple Choice

Which type of skeletal muscle contains abundant quantities of glycogen?

Multiple Choice

An entire skeletal muscle is surrounded by __________.

Multiple Choice

Which of the following statements is INCORRECT?

Multiple Choice

Where does 95% of the energy needed for contraction come from during moderate exercise?

Textbook Question

The connective tissue covering that encloses the sarcolemma of an individual muscle fiber is called the a. epimysium, b. perimysium, c. endomysium, d. periosteum.

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Textbook Question

A fascicle is a a. muscle, b. bundle of muscle fibers enclosed by a connective tissue sheath, c. bundle of myofibrils, d. group of myofilaments.

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Textbook Question

Thick and thin myofilaments have different compositions. For each descriptive phrase, indicate whether the filament is, a. thick or b. thin. _____ (1) contains actin _____ (2) contains ATPases _____ (3) attaches to the Z disc _____ (4) contains myosin _____ (5) contains troponin _____ (6) does not lie in the I band

Has a video solution.

Textbook Question

The function of the T tubules in muscle contraction is to a. make and store glycogen, b. release Ca²⁺ into the cell interior and then pick it up again, c. transmit the action potential deep into the muscle cells, d. form proteins.

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Textbook Question

True or false: Most muscles contain a predominance of one skeletal muscle fiber type. Explain the reasoning behind your choice.

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Textbook Question

The primary action of the biceps brachii muscle of the anterior arm is to flex the forearm at the elbow. However, when this muscle is inflamed, pain is felt in the shoulder. Explain this finding.

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Textbook Question

Which of the following types of muscle fibers have low myosin ATPase activity and are classified as slow-twitch?

a. Type I fibers

b. Type IIa fibers

c. Type IIx fibers

d. Type III fibers

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Textbook Question

Mr. Nasheed has cerebral palsy and suffers severe skeletal muscle spasms as a result of his condition. He is prescribed the drug dantrolene, which prevents the release of Ca2+ from the SR. Explain how this will treat his muscle spasms.

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Textbook Question

Michael had a nervous habit of chewing on the inner lining of his lip with his front teeth. The lip grew thicker and thicker from years of continual irritation. Michael's dentist noticed his greatly thickened lip, then told him to have it checked to see if the thickening was a tumor. A biopsy revealed hyperplasia, but no evidence of neoplasia. What do these terms mean? Did Michael have cancer of the mouth?

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Textbook Question

Why are the connective tissue wrappings of skeletal muscles important? Name these connective tissue coverings, beginning with the finest and ending with the coarsest. a.

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Textbook Question

Why are the connective tissue wrappings of skeletal muscles important? Name these connective tissue coverings, beginning with the finest and ending with the coarsest. b.

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Textbook Question

Compartment syndrome can result from all of the following except (a) compressing a nerve in the wrist, (b) compartments swelling with blood due to an injury involving blood vessels, (c) torn ligaments in a given compartment, (d) pulled tendons in the muscles of a given compartment, (e) torn muscles in a particular compartment.

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Textbook Question

Which of the following statements about myofibrils is not correct? (a) Each skeletal muscle fiber contains hundreds to thousands of myofibrils. (b) Myofibrils contain repeating units called sarcomeres. (c) Myofibrils extend the length of a skeletal muscle fiber. (d) Filaments consist of bundles of myofibrils. (e) Myofibrils are attached to the plasma membrane at both ends of a muscle fiber.

Has a video solution.

Textbook Question

An action potential can travel quickly from one cardiac muscle cell to another because of the presence of (a) gap junctions, (b) tight junctions, (c) intercalated discs, (d) both a and c.

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Textbook Question

What three layers of connective tissue are part of each muscle? What functional role does each layer play?

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Textbook Question

How does cardiac muscle tissue contract without neural stimulation?

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Textbook Question

Muscle tone keeps muscles healthy. What is muscle tone, and what causes it? What happens to a muscle that loses its tone?

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Textbook Question

Identify the structures in the following figure. a. ___ b. ___ c. ___ d. ___ e. ___ f. ___ g. ___ h. ___

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Textbook Question

Bill broke his leg in a football game, and after six weeks the cast is finally removed. As he steps down from the examination table, he loses his balance and falls. Why?

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Textbook Question

Multiple Choice More than one choice may apply. Your ability to lift that heavy couch would be increased by which type of exercise? a. Aerobic b. Endurance c. Resistance d. Swimming

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Textbook Question

The smooth muscle type found in the walls of digestive and urinary system organs and that exhibits gap junctions and pacemaker cells is a. multi unit, b. unitary.

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Textbook Question

Compare skeletal, smooth, and cardiac muscles in regard to their microscopic anatomy, location and arrangement in body organs, and function in the body.

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