Question 1

Which of the following describes the cells of unitary smooth muscle?

Accepted Answer

A)  They are used for vision and hair raising. 
B)  They exhibit spontaneous action potentials. 
C)  They depend upon recruitment using the autonomic nervous system. 
D)  They consist of muscle fibers that are structurally independent of each other. 
A)  They are used for vision and hair raising. 
B)  They exhibit spontaneous action potentials. 
C)  They depend upon recruitment using the autonomic nervous system. 
D)  They consist of muscle fibers that are structurally independent of each other.

Question 2

During vigorous exercise, there may be insufficient oxygen available to completely break down pyruvic acid for energy. As a result, the pyruvic acid is converted to .

Accepted Answer

A)  hydrochloric acid 
B)  a strong base 
C)  lactic acid 
D)  stearic acid 
A)  hydrochloric acid 
B)  a strong base 
C)  lactic acid 
D)  stearic acid

Question 3

Define physiologic muscle fatigue.

Accepted Answer

It is an inability o

Question 4

Muscle tissue has all of the following properties except .

Accepted Answer

A)  secretion 
B)  contractility 
C)  excitability 
D)  extensibility 
A)  secretion 
B)  contractility 
C)  excitability 
D)  extensibility

Question 5

The strongest muscle contractions are normally achieved by _ .

Accepted Answer

A)  recruiting small and medium muscle fibers 
B)  increasing stimulus above the threshold 
C)  increasing stimulus above the treppe stimulus 
D)  increasing the stimulation up to the maximal stimulus 
A)  recruiting small and medium muscle fibers 
B)  increasing stimulus above the threshold 
C)  increasing stimulus above the treppe stimulus 
D)  increasing the stimulation up to the maximal stimulus

Question 6

Fatigued muscle cells that recover rapidly are the products of .

Accepted Answer

A)  slow exercise of short duration 
B)  intense exercise of short duration 
C)  intense exercise of long duration 
D)  slow exercise of long duration 
A)  slow exercise of short duration 
B)  intense exercise of short duration 
C)  intense exercise of long duration 
D)  slow exercise of long duration

Question 7

Although there are no sarcomeres, smooth muscle still possesses thick and thin filaments.

Accepted Answer

A) True 
 B)False

Question 8

When a muscle fiber contracts, the I bands diminish in size, the H zones disappear, and the A bands do not diminish in length.

Accepted Answer

A) True 
 B)False

Question 9

What is the role of tropomyosin in skeletal muscles?

Accepted Answer

A)  Tropomyosin serves as a contraction inhibitor by blocking the actin binding sites on the myosin molecules. 
B)  Tropomyosin is the chemical that activates the myosin heads. 
C)  Tropomyosin is the receptor for the motor neuron neurotransmitter. 
D)  Tropomyosin serves as a contraction inhibitor by blocking the myosin binding sites on the actin molecules. 
A)  Tropomyosin serves as a contraction inhibitor by blocking the actin binding sites on the myosin molecules. 
B)  Tropomyosin is the chemical that activates the myosin heads. 
C)  Tropomyosin is the receptor for the motor neuron neurotransmitter. 
D)  Tropomyosin serves as a contraction inhibitor by blocking the myosin binding sites on the actin molecules.

Question 10

Gary was injured in an automobile accident that severed the motor neurons innervating his quadriceps. Even though he has had extensive physical therapy, he is still suffering muscle atrophy. Why is the therapy not working?

Accepted Answer

In denervation atrophy, fibrou

Question 11

Most skeletal muscles contain .

Accepted Answer

A)  a predominance of fast oxidative fibers 
B)  a predominance of slow oxidative fibers 
C)  muscle fibers of the same type 
D)  a mixture of fiber types 
A)  a predominance of fast oxidative fibers 
B)  a predominance of slow oxidative fibers 
C)  muscle fibers of the same type 
D)  a mixture of fiber types

Question 12

What is the functional unit of a skeletal muscle called?

Accepted Answer

A)  a myofibril 
B)  a sarcomere 
C)  the sarcoplasmic reticulum 
D)  a myofilament 
A)  a myofibril 
B)  a sarcomere 
C)  the sarcoplasmic reticulum 
D)  a myofilament

Question 13

In an isotonic contraction, the muscle _ .

Accepted Answer

A)  rapidly resynthesizes creatine phosphate and ATP 
B)  changes in length and moves the "load" 
C)  never converts pyruvate to lactate 
D)  does not change in length but increases tension 
A)  rapidly resynthesizes creatine phosphate and ATP 
B)  changes in length and moves the "load" 
C)  never converts pyruvate to lactate 
D)  does not change in length but increases tension

Question 14

One of the functions of skeletal muscle contraction is production of heat.

Accepted Answer

A) True 
 B)False

Question 15

Once a motor neuron has fired, all the muscle fibers in a muscle contract.

Accepted Answer

A) True 
 B)False

Question 16

The mechanism of contraction in smooth muscle is different from skeletal muscle in that _.

Accepted Answer

A)  ATP energizes the sliding process 
B)  actin and myosin interact by the sliding filament mechanism 
C)  the site of calcium regulation differs 
D)  the trigger for contraction is a rise in intracellular calcium 
A)  ATP energizes the sliding process 
B)  actin and myosin interact by the sliding filament mechanism 
C)  the site of calcium regulation differs 
D)  the trigger for contraction is a rise in intracellular calcium

Question 17

Which of the following is not a component of the standard treatment for muscle strain?

Accepted Answer

A)  elevation of the limb 
B)  rest of the muscle 
C)  ice on the muscle 
D)  stretching of the muscle 
A)  elevation of the limb 
B)  rest of the muscle 
C)  ice on the muscle 
D)  stretching of the muscle

Question 18

Of the following muscle types, which has only one nucleus, no sarcomeres, and rare gap junctions?

Accepted Answer

A)  cardiac muscle 
B)  multiunit smooth muscle 
C)  skeletal muscle 
D)  visceral smooth muscle 
A)  cardiac muscle 
B)  multiunit smooth muscle 
C)  skeletal muscle 
D)  visceral smooth muscle

Question 19

What is muscle tension?

Accepted Answer

Muscle tension is th

Question 20

Which of the following statements is most accurate?

Accepted Answer

A)  The I band lengthens during isotonic contraction. 
B)  Muscle tension remains relatively constant during isotonic contraction. 
C)  T tubules may be sliding during isotonic contraction. 
D)  Myofilaments slide during isometric contractions. 
A)  The I band lengthens during isotonic contraction. 
B)  Muscle tension remains relatively constant during isotonic contraction. 
C)  T tubules may be sliding during isotonic contraction. 
D)  Myofilaments slide during isometric contractions.

Exam 9: Muscles and Muscle Tissue

Which of the following describes the cells of unitary smooth muscle?

During vigorous exercise, there may be insufficient oxygen available to completely break down pyruvic acid for energy. As a result, the pyruvic acid is converted to .

Define physiologic muscle fatigue.

Muscle tissue has all of the following properties except .

The strongest muscle contractions are normally achieved by _ .

Fatigued muscle cells that recover rapidly are the products of .

Although there are no sarcomeres, smooth muscle still possesses thick and thin filaments.

When a muscle fiber contracts, the I bands diminish in size, the H zones disappear, and the A bands do not diminish in length.

What is the role of tropomyosin in skeletal muscles?

Gary was injured in an automobile accident that severed the motor neurons innervating his quadriceps. Even though he has had extensive physical therapy, he is still suffering muscle atrophy. Why is the therapy not working?

Most skeletal muscles contain .

What is the functional unit of a skeletal muscle called?

In an isotonic contraction, the muscle _ .

One of the functions of skeletal muscle contraction is production of heat.

Once a motor neuron has fired, all the muscle fibers in a muscle contract.

The mechanism of contraction in smooth muscle is different from skeletal muscle in that _.

Which of the following is not a component of the standard treatment for muscle strain?

Of the following muscle types, which has only one nucleus, no sarcomeres, and rare gap junctions?

What is muscle tension?

Which of the following statements is most accurate?

The Human Body: an Orientation

Chemistry Comes Alive

Cells: the Living Units

Tissue: the Living Fabric

The Integumentary System

Bones and Skeletal Tissues

The Skeleton

Joints

The Muscular System

Fundamentals of the Nervous System and Nervous Tissue

The Central Nervous System

The Peripheral Nervous System and Reflex Activity

The Autonomic Nervous System

The Special Senses

The Endocrine System

Blood

The Cardiovascular System: the Heart

The Cardiovascular System: Blood Vessels

The Lymphatic System and Lymphoid Organs and Tissues

The Immune System: Innate and Adaptive Body Defensives

The Respiratory System

The Digestive System

Nutrition, Metabolism, and Body Temperature Regulation

The Urinary System

Fluid, Electrolyte, and Acid-Base Balance

The Reproductive System

Pregnancy and Human Development

Heredity

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