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Exam 10: Muscle Tissue

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Question 41

Multiple Choice

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"Staircase" and "warming-up effect" refer to ___________,an increased muscle response to a constant stimulus.

A) wave summation
B) treppe
C) multiple motor unit summation
D) incomplete tetany
E) isotony

F) B) and E)
G) B) and D)

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Question 42

Multiple Choice

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When a muscle is isometrically contracted,its length _______ change.

A) does
B) does not

C) A) and B)
D) undefined

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Question 43

Multiple Choice

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Which letter is associated with the light band and contains thin filaments only

The plasma membrane of a skeletal muscle fiber is called the ______________.

With increased age,skeletal muscles show

Heavy breathing to compensate for an oxygen debt helps the body convert lactate to glucose.

Describe a hypothetical situation in which two isolated human populations evolve very different muscle fiber composition.In other words,what environmental conditions or food-gathering strategies might cause a prevalence of one fiber type (fast-twitch versus slow-twitch)to be more adaptive than another

The vascular supply to slow-twitch muscle fibers is ______ the network of capillaries around fast-twitch muscle fibers.

Which are possible functions of skeletal muscles A: Maintenance of posture B: Both highly coordinated and localized simple movements C: Temperature regulation D: Support of certain body organs E: Regulation of the movement of material through certain body tracts

In the hierarchy of skeletal muscle fiber components,the myofibril is made up of myofilaments.

The neuromuscular junction is usually located at one of the two ends of the muscle fiber.

Myosin light-chain phosphatase is an enzyme that dephosphorylates the myosin heads in smooth muscle,which stops ATPase activity and fosters relaxation of smooth muscle.

Relaxation is facilitated by the release of passive tension that developed in cablelike __________ proteins that were compressed during contraction.

Skeletal muscle contraction requires large amounts of energy in the form of ___________ in order to complete the sequence of cyclic events that lead to sarcomere shortening.

The type of muscle fibers that have only a single nucleus,both thick and thin filaments,but no Z discs,are

Smooth muscle tissue in which cells are individually sent signals to contract (rather than contracting in unison) is referred to as

Invaginations of the muscle cell membrane that extend deep into the cell are known as the

During which phase of the crossbridge cycle is ATP split into ADP and P_i

Which fibers dominate many of the back and calf muscles that contract almost continually to maintain posture

The structure responsible for attaching muscle to bone is a