Question 1

Skeletal muscles produce a major share of the heat generated by the body.

Accepted Answer

A) True 
 B)False

Question 2

Which of the following is an incorrect statement regarding heat production?

Accepted Answer

A)  The body temperature set point is established by the hypothalamus. 
B)  Shivering will increase body temperature. 
C)  Body temperature functions on a negative-feedback mechanism. 
D)  All of the above are correct.

Question 3

The primary function of tropomyosin and troponin is to prevent a muscle from contracting.

Accepted Answer

A) True 
 B)False

Question 4

Muscles contract more forcefully after they have contracted a few times.

Accepted Answer

A) True 
 B)False

Question 5

The striations seen in skeletal muscle cells under the microscope are what part of the sarcomere?

Accepted Answer

A)  Z-lines 
B)  A-bands 
C)  I-bands 
D)  All of the above

Question 6

Match each term with its corresponding description regarding the sliding-filament theory.
-Protein that has cross-bridge heads that pull on the thin fiber

Accepted Answer

A) Troponin 
B) Myosin 
C) Actin 
D) T-tubules 
E) ATP
F)Calcium
G)Cross-bridges
H)Tropomyosin
I)Acetylcholine

Question 7

In smooth muscle cells, the calcium needed for contraction comes from outside the cell rather than from inside the cell as it does in striated muscle contraction.

Accepted Answer

A) True 
 B)False

Question 8

Match each term with its corresponding description regarding the sliding-filament theory.
-Protein that has receptor sites for an ion that causes it to change shape and pull another protein away from the receptor sites on the actin

Accepted Answer

A) Troponin 
B) Myosin 
C) Actin 
D) T-tubules 
E) ATP
F)Calcium
G)Cross-bridges
H)Tropomyosin
I)Acetylcholine

Question 9

Muscles with less tone than normal are described as flaccid.

Accepted Answer

A) True 
 B)False

Question 10

Muscles with less-than-normal tone are described as in tetanus.

Accepted Answer

A) True 
 B)False

Question 11

Differentiate among slow, fast, and intermediate fibers.

Accepted Answer

The answer of Differentiate among slow, fast, and intermediate fibers....

Question 12

The pituitary gland is responsible for the homeostatic control of body temperature.

Accepted Answer

A) True 
 B)False

Question 13

The A-band in a relaxed sarcomere is composed of only actin.

Accepted Answer

A) True 
 B)False

Question 14

The sarcoplasmic reticulum continually pumps calcium ions out of the sarcoplasm and stores them in sacs.

Accepted Answer

A) True 
 B)False

Question 15

A sarcomere is a segment of myofibril between two successive:

Accepted Answer

A)  Z-lines. 
B)  A-bands. 
C)  I-bands. 
D)  H-bands.

Question 16

Actin, troponin, and tropomyosin are present on the thick myofilament.

Accepted Answer

A) True 
 B)False

Question 17

When sarcomeres shorten, myofibrils also shorten.

Accepted Answer

A) True 
 B)False

Question 18

Contraction of a small fraction of the total number of fibers in a muscle produces muscle tone.

Accepted Answer

A) True 
 B)False

Question 19

Single-unit smooth muscle is another term for visceral muscle.

Accepted Answer

A) True 
 B)False

Question 20

The protein molecule that has heads jutting out for cross-bridging is called myosin.

Accepted Answer

A) True 
 B)False

Exam 17: Muscle Contraction

Skeletal muscles produce a major share of the heat generated by the body.

Which of the following is an incorrect statement regarding heat production?

The primary function of tropomyosin and troponin is to prevent a muscle from contracting.

Muscles contract more forcefully after they have contracted a few times.

The striations seen in skeletal muscle cells under the microscope are what part of the sarcomere?

Match each term with its corresponding description regarding the sliding-filament theory. -Protein that has cross-bridge heads that pull on the thin fiber

In smooth muscle cells, the calcium needed for contraction comes from outside the cell rather than from inside the cell as it does in striated muscle contraction.

Match each term with its corresponding description regarding the sliding-filament theory. -Protein that has receptor sites for an ion that causes it to change shape and pull another protein away from the receptor sites on the actin

Muscles with less tone than normal are described as flaccid.

Muscles with less-than-normal tone are described as in tetanus.

Differentiate among slow, fast, and intermediate fibers.

The pituitary gland is responsible for the homeostatic control of body temperature.

The A-band in a relaxed sarcomere is composed of only actin.

The sarcoplasmic reticulum continually pumps calcium ions out of the sarcoplasm and stores them in sacs.

A sarcomere is a segment of myofibril between two successive:

Actin, troponin, and tropomyosin are present on the thick myofilament.

When sarcomeres shorten, myofibrils also shorten.

Contraction of a small fraction of the total number of fibers in a muscle produces muscle tone.

Single-unit smooth muscle is another term for visceral muscle.

The protein molecule that has heads jutting out for cross-bridging is called myosin.