Question 1

The motor end plate makes up part of the:

Accepted Answer

A) Z-line. 
B) T-tubules. 
C) sarcoplasmic reticulum. 
D) neuromuscular junction. 
A) Z-line. 
B) T-tubules. 
C) sarcoplasmic reticulum. 
D) neuromuscular junction.

Question 2

There are three high-energy bonds in an ATP molecule.

Accepted Answer

A) True 
 B)False

Question 3

Which of the following statements is incorrect about motor units?

Accepted Answer

A) Some motor neurons stimulate only a few dozen muscle fibers. 
B) Some motor neurons stimulate a few thousand muscle fibers. 
C) The more muscle fibers stimulated by a motor neuron, the more precise the movements of that muscle can be. 
D) All of the above statements are correct. 
A) Some motor neurons stimulate only a few dozen muscle fibers. 
B) Some motor neurons stimulate a few thousand muscle fibers. 
C) The more muscle fibers stimulated by a motor neuron, the more precise the movements of that muscle can be. 
D) All of the above statements are correct.

Question 4

Match each term with its corresponding definition or description.
-Beadlike globular protein that makes up the thin myofilament

Accepted Answer

A) Actin 
B) Sarcolemma 
C) Contractility 
D) Tropomyosin 
E) Extensibility
F)Myosin
G)T-tubule
H)Irritability
I)Sarcomere
J)Troponin
K)Motor unit 
A) Actin 
B) Sarcolemma 
C) Contractility 
D) Tropomyosin 
E) Extensibility
F)Myosin
G)T-tubule
H)Irritability
I)Sarcomere
J)Troponin
K)Motor unit

Question 5

The substance that attracts oxygen in the myoglobin molecule is:

Accepted Answer

A) hemoglobin. 
B) calcium. 
C) iron. 
D) ATP. 
A) hemoglobin. 
B) calcium. 
C) iron. 
D) ATP.

Question 6

Myofibrils contain several sarcomeres lined up end to end.

Accepted Answer

A) True 
 B)False

Question 7

Cardiac muscle is similar to skeletal muscle in that both form strong, electrically coupled junctions with other fibers.

Accepted Answer

A) True 
 B)False

Question 8

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. 
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.

Question 9

Which of the following is not an end-product of the breakdown of ATP?

Accepted Answer

A) An inorganic phosphate 
B) Energy that can be used in muscle contraction 
C) ADP 
D) All of the above are end-products of the breakdown of ATP. 
A) An inorganic phosphate 
B) Energy that can be used in muscle contraction 
C) ADP 
D) All of the above are end-products of the breakdown of ATP.

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

Multiunit smooth muscle is more common in the body than single-unit smooth muscle.

Accepted Answer

A) True 
 B)False

Question 12

Differentiate among slow, fast, and intermediate fibers.

Accepted Answer

Slow, fast, and intermediate fibers refe

Question 13

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

Accepted Answer

A) True 
 B)False

Question 14

Which of the following types of muscle tissue contains cells that have a single nucleus?

Accepted Answer

A) Cardiac 
B) Smooth 
C) Skeletal 
D) Both A and B 
A) Cardiac 
B) Smooth 
C) Skeletal 
D) Both A and B

Question 15

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

Question 16

The sliding-filament theory is the current model of muscle contraction.

Accepted Answer

A) True 
 B)False

Question 17

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

Accepted Answer

A) True 
 B)False

Question 18

In smooth muscle cells, the protein calmodulin takes the place of the sarcoplasmic reticulum found in striated muscle cells.

Accepted Answer

A) True 
 B)False

Question 19

Another name for muscle cells is muscle fibers.

Accepted Answer

A) True 
 B)False

Question 20

Endurance training is also known as:

Accepted Answer

A) isometrics. 
B) hypertrophy. 
C) aerobic training. 
D) strength training. 
A) isometrics. 
B) hypertrophy. 
C) aerobic training. 
D) strength training.

Exam 17: Muscle Contraction

The motor end plate makes up part of the:

There are three high-energy bonds in an ATP molecule.

Which of the following statements is incorrect about motor units?

Match each term with its corresponding definition or description. -Beadlike globular protein that makes up the thin myofilament

The substance that attracts oxygen in the myoglobin molecule is:

Myofibrils contain several sarcomeres lined up end to end.

Cardiac muscle is similar to skeletal muscle in that both form strong, electrically coupled junctions with other fibers.

The first event to occur in muscle relaxation is that:

Which of the following is not an end-product of the breakdown of ATP?

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

Multiunit smooth muscle is more common in the body than single-unit smooth muscle.

Differentiate among slow, fast, and intermediate fibers.

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

Which of the following types of muscle tissue contains cells that have a single nucleus?

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

The sliding-filament theory is the current model of muscle contraction.

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

In smooth muscle cells, the protein calmodulin takes the place of the sarcoplasmic reticulum found in striated muscle cells.

Another name for muscle cells is muscle fibers.

Endurance training is also known as:

Organization of the Body

Homeostasis

Chemistry of Life

Biomolecules

Cell Structure

Cell Function

Cell Growth and Development

Introduction to Tissues

Tissue Types

Skin

Skeletal Tissues

Axial Skeleton

Appendicular Skeleton

Articulations

Axial Muscles

Appendicular Muscles

Nervous System Cells

Nerve Signaling

Central Nervous System

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Autonomic Nervous System

General Senses

Special Senses

Endocrine Regulation

Endocrine Glands

Blood

Heart

Blood Vessels

Circulation of the Blood

Lymphatic System

Innate Immunity

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Stress

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Gas Exchange Transport

Upper Digestive Tract

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Digestion and Absorption

Nutrition and Metabolism

Urinary System

Fluid and Electrolyte Balance

Acid-Base Balance

Male Reproductive System

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Growth, Development, and Aging

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