Question 1

Select the incorrect statement about muscle and muscle fibers.

Accepted Answer

A) Long distance runners tend to have more slow-twitch muscle fibers than fast-twitch fibers. 
B) A quick contraction and relaxation of an isolated skeletal muscle is called tetanus. 
C) Fast-twitch fibers have fewer capillaries and mitochondria than slow-twitch fibers. 
D) Slow-twitch muscle fibers have high concentrations of myoglobin. 
A) Long distance runners tend to have more slow-twitch muscle fibers than fast-twitch fibers. 
B) A quick contraction and relaxation of an isolated skeletal muscle is called tetanus. 
C) Fast-twitch fibers have fewer capillaries and mitochondria than slow-twitch fibers. 
D) Slow-twitch muscle fibers have high concentrations of myoglobin.

Question 2

Impulses conducted along the transverse tubules of the muscle fiber stimulate

Accepted Answer

A) the release of ATP. 
B) the binding of actin to the Z lines. 
C) tropomyosin and troponin binding. 
D) the release of calcium ions. 
A) the release of ATP. 
B) the binding of actin to the Z lines. 
C) tropomyosin and troponin binding. 
D) the release of calcium ions.

Question 3

Which of the following is required to detach myosin from actin?

Accepted Answer

A) calcium 
B) ATP 
C) phosphate 
D) troponin 
A) calcium 
B) ATP 
C) phosphate 
D) troponin

Question 4

Shown below is an electron micrograph of part of a myofibril from a relaxed muscle fiber.Which of the labeled regions will NOT shorten when the muscle contracts?

Accepted Answer

A) A band 
B) Sarcomere 
C) H band 
D) I band 
A) A band 
B) Sarcomere 
C) H band 
D) I band

Question 5

The human skeleton is a typical vertebrate

Accepted Answer

A) exoskeleton. 
B) hydrostatic skeleton. 
C) axial skeleton only. 
D) endoskeleton. 
A) exoskeleton. 
B) hydrostatic skeleton. 
C) axial skeleton only. 
D) endoskeleton.

Exam 46: The Musculoskeletal System

Select the incorrect statement about muscle and muscle fibers.

Impulses conducted along the transverse tubules of the muscle fiber stimulate

Which of the following is required to detach myosin from actin?

Shown below is an electron micrograph of part of a myofibril from a relaxed muscle fiber.Which of the labeled regions will NOT shorten when the muscle contracts?

The human skeleton is a typical vertebrate

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