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Exam 8: Muscle Physiology

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Question 71

Multiple Choice

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In a muscle fiber undergoing maximal tetanic stimulation, the velocity of shortening ____ as the load ____.

A) decreases; decreases
B) decreases; increases
C) increases; increases
D) remains constant; increases
E) remains constant; decreases

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Question 72

Multiple Choice

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The origin of a muscle is its

A) main, thickest part
B) middle, thinner part
C) movable end of attachment
D) source of development in the fetus
E) stationary end of attachment

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Question 73

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Skeletal muscle cells contain intracellular contractile proteins, including troponin and tropomyosin.

Fast-glycolytic muscle fibers do not require as much oxygen use as slow-oxidative fibers.

Indicate which of the muscle proteins in skeletal muscle is associated with the item in question by writing the appropriate letters in the blanks using the answer code below: a.actin only b.myosin only c.actin and myosin d.troponin-tropomyosin complex e.actin, troponin, and tropomyosin f.actin, myosin, troponin, and tropomyosin -Contractile protein(s)

Indicate which characteristic applies to the specific type of muscle contraction: a.isometric b.isotonic c.eccentric d.concentric e.isometric and eccentric f.isotonic and concentric g.isotonic, eccentric, and concentric -Does not accomplish any work

An exercising muscle's inability to respond to stimulation due to a buildup of inorganic phosphate or a depletion of glycogen is called _______, whereas, it is called ______ (two words) if it results from a lack of muscle stimulation by the nervous system.

Muscles developing tension while lengthening are performing ____ contractions.

The T tubule is lined with the muscle cell's membrane.

Dihydropyridine receptors are most closely associated with

Myosin is

Thin and thick filaments overlap in the A band.

The ____________________ stores calcium ions inside muscle cells.

Which of the following changes in banding pattern occur during muscle relaxation?

The two types of fast twitch fibers are interconvertible depending on the type of conditioning they receive.

With eccentric muscle contractions,

Which of the following is most closely associated with a skeletal muscle fiber's latent period?

Asynchronous recruitment gives motors units that have been active an opportunity to rest while others are firing.

____________________ is the pigment that can store small amounts of oxygen in the skeletal muscle.

The metabolic capability of a muscle fiber can affect the degree of tension it can develop.