Question 1

Figure 10-2 Muscle Contractions
Use Figure 10-2 to answer the following questions:
-What is thought to happen in a muscle during the response shown in graph (a)?

Accepted Answer

A) It is strengthening with exercise. 
B) There is a gradual increase in calcium ion concentration in the sarcoplasm. 
C) It is fatigued and must make repeated efforts to twitch normally. 
D) It is aged and has lost contractile proteins. 
E) It is producing more ATP as tension increases. 
A) It is strengthening with exercise. 
B) There is a gradual increase in calcium ion concentration in the sarcoplasm. 
C) It is fatigued and must make repeated efforts to twitch normally. 
D) It is aged and has lost contractile proteins. 
E) It is producing more ATP as tension increases.

Question 2

Muscular force can be adjusted to match different loads by

Accepted Answer

A) varying the frequency of action potentials in motor neurons. 
B) recruiting larger motor units. 
C) recruiting more motor units. 
D) involving more muscle fibers in the contraction. 
E) All of the answers are correct. 
A) varying the frequency of action potentials in motor neurons. 
B) recruiting larger motor units. 
C) recruiting more motor units. 
D) involving more muscle fibers in the contraction. 
E) All of the answers are correct.

Question 3

Figure 10-1 Skeletal Muscle Fiber
Use Figure 10-1 to answer the following questions:
-Identify the structure(s)where ATP is consumed?

Accepted Answer

A) 3 
B) 6 
C) 3 and 6 
D) 7 
E) 3 and 7 
A) 3 
B) 6 
C) 3 and 6 
D) 7 
E) 3 and 7

Question 4

Which of the following statements is false?

Accepted Answer

A) Cardiac muscle contractions cannot be summated. 
B) Skeletal muscle contractions may be summated. 
C) Skeletal muscle and cardiac muscle stimulation is neural. 
D) Cardiac muscle has a striated appearance. 
E) Cardiocytes are interconnected through intercalated discs. 
A) Cardiac muscle contractions cannot be summated. 
B) Skeletal muscle contractions may be summated. 
C) Skeletal muscle and cardiac muscle stimulation is neural. 
D) Cardiac muscle has a striated appearance. 
E) Cardiocytes are interconnected through intercalated discs.

Question 5

Active sites become exposed when calcium ions bind to

Accepted Answer

A) tropomyosin. 
B) actin. 
C) myosin. 
D) troponin. 
E) calcium channels. 
A) tropomyosin. 
B) actin. 
C) myosin. 
D) troponin. 
E) calcium channels.

Question 6

Figure 10-1 Skeletal Muscle Fiber
Use Figure 10-1 to answer the following questions:
-Where are the myosin molecules located?

Accepted Answer

A) 4 
B) 5 
C) 6 
D) 7 
E) 8 
A) 4 
B) 5 
C) 6 
D) 7 
E) 8

Question 7

Thirty minutes after Mary has completed a 25-km race,she begins to notice severe muscle soreness and stiffness in her legs.Her urine is dark colored.She wonders whether she may have damaged her muscles during the race.She visits the ER,and the doctor orders several blood tests.What kind of blood tests can help determine whether muscle damage has occurred?

Accepted Answer

If muscle damage occurred,the doctor wou

Question 8

Megan wants to enter a weight-lifting competition and consults you as to what type of muscle fibers she needs to develop and how she should go about it.What would you suggest to her?

Accepted Answer

Weight lifting requires anaerobic endura

Question 9

The plasma membrane of a skeletal muscle fiber is called the

Accepted Answer

A) sarcolemma. 
B) sarcomere. 
C) sarcosome. 
D) sarcoplasmic reticulum. 
E) sarcoplasm. 
A) sarcolemma. 
B) sarcomere. 
C) sarcosome. 
D) sarcoplasmic reticulum. 
E) sarcoplasm.

Question 10

The following is a list of the events that occur during a muscle contraction.What is the correct sequence of these events?
1)Myosin cross-bridges bind to the actin.
2)The free myosin head splits ATP.
3)Calcium ion is released from the sarcoplasmic reticulum.
4)The myosin head pivots toward the center of the sarcomere.
5)Calcium ion binds to troponin.
6)The myosin head binds an ATP molecule and detaches from the actin.

Accepted Answer

A) 1,3,5,4,6,2 
B) 5,1,4,6,2,3 
C) 3,5,1,2,4,6 
D) 3,5,1,4,6,2 
E) 1,4,6,2,3,5 
A) 1,3,5,4,6,2 
B) 5,1,4,6,2,3 
C) 3,5,1,2,4,6 
D) 3,5,1,4,6,2 
E) 1,4,6,2,3,5

Question 11

In the liver,during the Cori cycle,

Accepted Answer

A) glucose is released from glycogen. 
B) lactic acid is produced from glucose. 
C) glucose is produced from lactic acid. 
D) lactic acid is produced from pyruvic acid. 
E) lactic acid is shuffled to muscle cells. 
A) glucose is released from glycogen. 
B) lactic acid is produced from glucose. 
C) glucose is produced from lactic acid. 
D) lactic acid is produced from pyruvic acid. 
E) lactic acid is shuffled to muscle cells.

Question 12

In which of the following would the motor units have the fewest muscle fibers?

Accepted Answer

A) muscles of the neck 
B) postural muscles of the back 
C) muscles that control the eyes 
D) thigh muscles 
E) calf muscles 
A) muscles of the neck 
B) postural muscles of the back 
C) muscles that control the eyes 
D) thigh muscles 
E) calf muscles

Question 13

The ability of smooth muscle to function over a wide range of lengths is called

Accepted Answer

A) elasticity. 
B) contractility. 
C) extensibility. 
D) plasticity. 
E) variability. 
A) elasticity. 
B) contractility. 
C) extensibility. 
D) plasticity. 
E) variability.

Question 14

How would an elevated level of thyroid hormone in the body affect skeletal muscles?

Accepted Answer

A) It would stimulate atrophy. 
B) It would stimulate hypertrophy. 
C) It would stimulate energy use and heat production. 
D) It would decrease heat production by muscle tissue. 
E) It would cause an increase in muscle mass. 
A) It would stimulate atrophy. 
B) It would stimulate hypertrophy. 
C) It would stimulate energy use and heat production. 
D) It would decrease heat production by muscle tissue. 
E) It would cause an increase in muscle mass.

Question 15

Which of the following is not a function of smooth muscle tissue?

Accepted Answer

A) altering the diameter of the respiratory passageways 
B) elevating hairs on the arm 
C) forcing blood from the heart into the major arteries 
D) moving food materials along the digestive tract 
E) forcing urine out of the urinary tract 
A) altering the diameter of the respiratory passageways 
B) elevating hairs on the arm 
C) forcing blood from the heart into the major arteries 
D) moving food materials along the digestive tract 
E) forcing urine out of the urinary tract

Question 16

The protein that regulates muscle contraction by controlling the availability of active sites on actin is called

Accepted Answer

A) actin. 
B) titin. 
C) myosin. 
D) tropomyosin. 
E) nebulin. 
A) actin. 
B) titin. 
C) myosin. 
D) tropomyosin. 
E) nebulin.

Question 17

Figure 10-1 Skeletal Muscle Fiber
Use Figure 10-1 to answer the following questions:
-Which structure contains the motor end plate?

Accepted Answer

A) 1 
B) 2 
C) 3 
D) 5 
E) 8 
A) 1 
B) 2 
C) 3 
D) 5 
E) 8

Question 18

The muscle weakness of myasthenia gravis results from

Accepted Answer

A) insufficient acetylcholine release from presynaptic vesicles. 
B) loss of acetylcholine receptors in the end-plate membrane. 
C) the motor neuron action potential being too small to stimulate the muscle fibers. 
D) excessive acetylcholinesterase that destroys the neurotransmitter. 
E) inability of the muscle fiber to produce ATP. 
A) insufficient acetylcholine release from presynaptic vesicles. 
B) loss of acetylcholine receptors in the end-plate membrane. 
C) the motor neuron action potential being too small to stimulate the muscle fibers. 
D) excessive acetylcholinesterase that destroys the neurotransmitter. 
E) inability of the muscle fiber to produce ATP.

Question 19

The dense layer of connective tissue that surrounds an entire skeletal muscle is the

Accepted Answer

A) tendon. 
B) epimysium. 
C) endomysium. 
D) perimysium. 
E) fascicle. 
A) tendon. 
B) epimysium. 
C) endomysium. 
D) perimysium. 
E) fascicle.

Question 20

Which of the following best describes the term sarcoplasmic reticulum?

Accepted Answer

A) protein that accounts for elasticity of resting muscle 
B) repeating unit of striated myofibrils 
C) storage and release site for calcium ions 
D) thin filaments are anchored here 
E) largely made of myosin molecules 
A) protein that accounts for elasticity of resting muscle 
B) repeating unit of striated myofibrils 
C) storage and release site for calcium ions 
D) thin filaments are anchored here 
E) largely made of myosin molecules

Exam 10: Muscle Tissue

Figure 10-2 Muscle Contractions Use Figure 10-2 to answer the following questions: -What is thought to happen in a muscle during the response shown in graph (a)?

Muscular force can be adjusted to match different loads by

Figure 10-1 Skeletal Muscle Fiber Use Figure 10-1 to answer the following questions: -Identify the structure(s)where ATP is consumed?

Which of the following statements is false?

Active sites become exposed when calcium ions bind to

Figure 10-1 Skeletal Muscle Fiber Use Figure 10-1 to answer the following questions: -Where are the myosin molecules located?

Megan wants to enter a weight-lifting competition and consults you as to what type of muscle fibers she needs to develop and how she should go about it.What would you suggest to her?

The plasma membrane of a skeletal muscle fiber is called the

In the liver,during the Cori cycle,

In which of the following would the motor units have the fewest muscle fibers?

The ability of smooth muscle to function over a wide range of lengths is called

How would an elevated level of thyroid hormone in the body affect skeletal muscles?

Which of the following is not a function of smooth muscle tissue?

The protein that regulates muscle contraction by controlling the availability of active sites on actin is called

Figure 10-1 Skeletal Muscle Fiber Use Figure 10-1 to answer the following questions: -Which structure contains the motor end plate?

The muscle weakness of myasthenia gravis results from

The dense layer of connective tissue that surrounds an entire skeletal muscle is the

Which of the following best describes the term sarcoplasmic reticulum?

An Introduction to Anatomy and Physiology

The Chemical Level of Organization

The Cellular Level of Organization

The Tissue Level of Organization

The Integumentary System

Osseous Tissue and Bone Structure

The Axial Skeleton

The Appendicular Skeleton

Joints

The Muscular System

Neural Tissue

The Spinal Cord, spinal Nerves, and Spinal Reflexes

The Brain and Cranial Nerves

Sensory Pathways and the Somatic Nervous System

The Autonomic Nervous System and Higher-Order Functions

The Special Senses

The Endocrine System

Blood

The Heart

Blood Vessels and Circulation

The Lymphatic System and Immunity

The Respiratory System

The Digestive System

Metabolism and Energetics

The Urinary System

Fluid, electrolyte, and Acid-Base Balance

The Reproductive System

Development and Inheritance

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