Question 1

A satellite cell can fuse with myocytes during strength training to make larger muscle fibers.

Accepted Answer

A) True 
 B)False

Question 2

Myosin filaments attach to the Z disk.

Accepted Answer

A) True 
 B)False

Question 3

Describe the structure of smooth muscle. Differentiate between single-unit and multiunit muscle tissue.

Accepted Answer

Smooth muscle is a type of muscle tissue...

Question 4

Which of the following statements about cardiac muscle is incorrect?

Accepted Answer

A)   Cardiac muscle requires nervous stimulation to contract.
B)   Cardiac muscle is also called striated involuntary muscle.
C)   Cardiac muscle contains intercalated disks.
D)   All of the above statements are correct.E) None of the above
F) B) and D)

Question 5

The myofibrils contain about how many sarcomeres?

Accepted Answer

A)   150,000
B)   15,000
C)   1500
D)   150E) C) and D)
F) None of the above

Question 6

The characteristic of the muscle cell that directly causes movement is:

Accepted Answer

A)   excitability.
B)   irritability.
C)   contractility.
D)   extensibility.E) B) and C)
F) C) and D)

Question 7

When the muscle looks "at rest," the ATP has already transferred its energy to the actin fiber.

Accepted Answer

A) True 
 B)False

Question 8

Hemoglobin carries oxygen in red blood cells, and myoglobin stores oxygen in muscle fibers.

Accepted Answer

A) True 
 B)False

Question 9

The release of calcium by the sarcoplasmic reticulum begins the contraction phase of a twitch contraction.

Accepted Answer

A) True 
 B)False

Question 10

The shorter a muscle before contraction, the more tension it will be able to generate.

Accepted Answer

A) True 
 B)False

Question 11

The first event to occur in muscle relaxation is that:

Accepted Answer

A)   tropomyosin returns to its original position.
B)   myosin cross-bridges are prevented from binding to actin.
C)   the sarcoplasmic reticulum begins actively pumping calcium back into its sacs.
D)   acetylcholine is released.E) All of the above
F) C) and D)

Question 12

In the structure called a triad, the T-tubule is sandwiched between:

Accepted Answer

A)   actin filaments.
B)   myofibrils.
C)   sarcolemmas.
D)   sacs of sarcoplasmic reticulum.E) A) and B)
F) All of the above

Question 13

The lactic acid produced by anaerobic respiration is converted back to glucose in the:

Accepted Answer

A)   lungs.
B)   liver.
C)   mitochondria.
D)   sarcoplasmic reticulum.E) A) and B)
F) B) and D)

Question 14

Cardiac muscles require a stimulus from a motor neuron to contract, just as striated muscles do.

Accepted Answer

A) True 
 B)False

Question 15

All of the following are characteristics of smooth muscle except:

Accepted Answer

A)   there are no striations.
B)   there are no T-tubules.
C)   thin and thick filaments are aligned in sarcomeres like skeletal muscles.
D)   the sarcoplasmic reticula are loosely organized.E) A) and D)
F) B) and D)

Question 16

Tonic contractions give the muscle its muscle tone.

Accepted Answer

A) True 
 B)False

Question 17

Match each term with its corresponding definition or description.
-Inward extensions of the sarcolemma that allow impulses to go deeper into the cell

Accepted Answer

A)  Actin
B)  Sarcolemma
C)  Contractility
D)  Tropomyosin
E)  ExtensibilityF) MyosinG) T-tubuleH) IrritabilityI) SarcomereJ) TroponinK) Motor unitL) C) and D)
M) G) and J)

Question 18

Muscles usually contract to about _____ of their length.

Accepted Answer

A)   30%
B)   40%
C)   80%
D)   90%E) C) and D)
F) B) and D)

Question 19

Name and describe the myofilament fibers in the sarcomere.

Accepted Answer

The sarcomere is the basic contractile u...

Question 20

Myocyte is another term for a muscle cell.

Accepted Answer

A) True 
 B)False

Exam 17: Muscle Contraction

A satellite cell can fuse with myocytes during strength training to make larger muscle fibers.

Correct AnswerverifiedShow Answer

Match each term with its corresponding definition or description. -Inward extensions of the sarcolemma that allow impulses to go deeper into the cell

Correct AnswerverifiedShow Answer

Myocyte is another term for a muscle cell.

Correct AnswerverifiedShow Answer

When the muscle looks "at rest," the ATP has already transferred its energy to the actin fiber.

Correct AnswerverifiedShow Answer

Muscles usually contract to about _____ of their length.

Correct AnswerverifiedShow Answer

The first event to occur in muscle relaxation is that:

Correct AnswerverifiedShow Answer

Cardiac muscles require a stimulus from a motor neuron to contract, just as striated muscles do.

Correct AnswerverifiedShow Answer

Hemoglobin carries oxygen in red blood cells, and myoglobin stores oxygen in muscle fibers.

Correct AnswerverifiedShow Answer

The lactic acid produced by anaerobic respiration is converted back to glucose in the:

Correct AnswerverifiedShow Answer

Which of the following statements about cardiac muscle is incorrect?

Correct AnswerverifiedShow Answer

Tonic contractions give the muscle its muscle tone.

Correct AnswerverifiedShow Answer

All of the following are characteristics of smooth muscle except:

Correct AnswerverifiedShow Answer

The myofibrils contain about how many sarcomeres?

Correct AnswerverifiedShow Answer

Describe the structure of smooth muscle. Differentiate between single-unit and multiunit muscle tissue.

Correct AnswerAnswered by ExamLex AISmooth muscle is a type of muscle tissue...View AnswerShow Answer

The release of calcium by the sarcoplasmic reticulum begins the contraction phase of a twitch contraction.

Correct AnswerverifiedShow Answer

In the structure called a triad, the T-tubule is sandwiched between:

Correct AnswerverifiedShow Answer

Name and describe the myofilament fibers in the sarcomere.

Correct AnswerAnswered by ExamLex AIThe sarcomere is the basic contractile u...View AnswerShow Answer

The characteristic of the muscle cell that directly causes movement is:

Correct AnswerverifiedShow Answer

Myosin filaments attach to the Z disk.

Correct AnswerverifiedShow Answer

The shorter a muscle before contraction, the more tension it will be able to generate.

Correct AnswerverifiedShow Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
Answered by ExamLex AI
Smooth muscle is a type of muscle tissue...
View Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
Answered by ExamLex AI
The sarcomere is the basic contractile u...
View Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified