Question 1

Which statement about the microscopic anatomy of skeletal muscle fibers is true?

Accepted Answer

A) Tubular extensions of the sarcolemma penetrate the fiber transversely. 
B) Cross striations result from the lateral alignment of thick and thin filaments. 
C) Each fiber has many nuclei. 
D) Muscle fibers are continuous from tendon to tendon. 
E) All of the answers are correct. 
A) Tubular extensions of the sarcolemma penetrate the fiber transversely. 
B) Cross striations result from the lateral alignment of thick and thin filaments. 
C) Each fiber has many nuclei. 
D) Muscle fibers are continuous from tendon to tendon. 
E) All of the answers are correct.

Question 2

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

Question 3

In a sarcomere,cross-bridge attachment occurs specifically in the

Accepted Answer

A) zone of overlap. 
B) A band. 
C) I band. 
D) M line. 
E) H band. 
A) zone of overlap. 
B) A band. 
C) I band. 
D) M line. 
E) H band.

Question 4

Active sites on the actin become available for binding after

Accepted Answer

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

Question 5

Fast fibers

Accepted Answer

A) have low resistance to fatigue. 
B) rely on aerobic metabolism. 
C) have many mitochondria. 
D) have twitches with a very brief contraction phase. 
E) have low resistance to fatigue and have quick twitches. 
A) have low resistance to fatigue. 
B) rely on aerobic metabolism. 
C) have many mitochondria. 
D) have twitches with a very brief contraction phase. 
E) have low resistance to fatigue and have quick twitches.

Question 6

The rapid rise and fall in force produced by a muscle fiber after a single action potential is

Accepted Answer

A) a tetanus. 
B) an unfused tetanus. 
C) a twitch. 
D) an end plate potential. 
E) a muscle action potential. 
A) a tetanus. 
B) an unfused tetanus. 
C) a twitch. 
D) an end plate potential. 
E) a muscle action potential.

Question 7

Interactions between actin and myosin filaments of the sarcomere are responsible for

Accepted Answer

A) muscle fatigue. 
B) the conduction of neural stimulation to the muscle fiber. 
C) muscle contraction. 
D) muscle relaxation. 
E) the striped appearance of skeletal muscle. 
A) muscle fatigue. 
B) the conduction of neural stimulation to the muscle fiber. 
C) muscle contraction. 
D) muscle relaxation. 
E) the striped appearance of skeletal muscle.

Question 8

The region of the sarcomere containing the thick filaments is the

Accepted Answer

A) Z line. 
B) M line. 
C) H band. 
D) A band. 
E) I band. 
A) Z line. 
B) M line. 
C) H band. 
D) A band. 
E) I band.

Question 9

Each skeletal muscle fiber is controlled by a motor neuron at a single

Accepted Answer

A) synaptic knob. 
B) sarcomere. 
C) neuromuscular junction. 
D) synaptic cleft. 
E) transverse tubule. 
A) synaptic knob. 
B) sarcomere. 
C) neuromuscular junction. 
D) synaptic cleft. 
E) transverse tubule.

Question 10

Which of the following statements is (are)true regarding human muscles?

Accepted Answer

A) Most have both slow and fast fibers. 
B) Slow fibers are abundant in the calf muscles. 
C) Eye muscles are composed entirely of fast fibers. 
D) Slow fibers are abundant in the back muscles. 
E) All of the answers are correct. 
A) Most have both slow and fast fibers. 
B) Slow fibers are abundant in the calf muscles. 
C) Eye muscles are composed entirely of fast fibers. 
D) Slow fibers are abundant in the back muscles. 
E) All of the answers are correct.

Question 11

Nerves and blood vessels that service a muscle fiber are located in the connective tissues of its

Accepted Answer

A) endomysium. 
B) perimysium. 
C) sarcolemma. 
D) sarcomere. 
E) myofibrils. 
A) endomysium. 
B) perimysium. 
C) sarcolemma. 
D) sarcomere. 
E) myofibrils.

Question 12

Figure 10-2 Muscle Contractions
Use Figure 10-2 to answer the following question:
-To produce a contraction similar to the one in graph (b),the muscle

Accepted Answer

A) must be stimulated to the point of fatigue. 
B) must be stimulated again before it has relaxed from the previous stimulation. 
C) is excited by a stimulus of increasing intensity. 
D) is caused to produce isolated twitches. 
E) gradually warms up. 
A) must be stimulated to the point of fatigue. 
B) must be stimulated again before it has relaxed from the previous stimulation. 
C) is excited by a stimulus of increasing intensity. 
D) is caused to produce isolated twitches. 
E) gradually warms up.

Question 13

During the recovery period the body's need for oxygen is increased because

Accepted Answer

A) muscle cells are producing energy anaerobically. 
B) the individual is panting. 
C) additional oxygen is required to restore energy reserves consumed during exercise. 
D) the liver requires more oxygen to produce lactic acid. 
E) the muscles are not producing ATP. 
A) muscle cells are producing energy anaerobically. 
B) the individual is panting. 
C) additional oxygen is required to restore energy reserves consumed during exercise. 
D) the liver requires more oxygen to produce lactic acid. 
E) the muscles are not producing ATP.

Question 14

At each end of the muscle,the collagen fibers of the epimysium,and each perimysium and endomysium,come together to form a

Accepted Answer

A) tendon. 
B) satellite cell. 
C) ligament. 
D) tenosynovium. 
E) sheath. 
A) tendon. 
B) satellite cell. 
C) ligament. 
D) tenosynovium. 
E) sheath.

Question 15

A weight-lifter strains to lift a heavy weight and there is no movement of the person's arms holding on to the weight. This type of contraction is called a/an ________ contraction.

Accepted Answer

A) isometric 
B) tetanus 
C) isotonic 
D) treppe 
E) concentric 
A) isometric 
B) tetanus 
C) isotonic 
D) treppe 
E) concentric

Question 16

Figure 10-1 Skeletal Muscle Fiber
Use Figure 10-1 to answer the following question:
-Identify the structure where ATP is produced.

Accepted Answer

A) 6 
B) 7 
C) 1 
D) 3 
E) 2 
A) 6 
B) 7 
C) 1 
D) 3 
E) 2

Question 17

Figure 10-2 Muscle Contractions
Use Figure 10-2 to answer the following question:
-What is the contraction in graph (a)called?

Accepted Answer

A) complete tetanus 
B) incomplete tetanus 
C) twitch 
D) wave summation 
E) treppe 
A) complete tetanus 
B) incomplete tetanus 
C) twitch 
D) wave summation 
E) treppe

Question 18

Figure 10-1 Skeletal Muscle Fiber
Use Figure 10-1 to answer the following question:
-What is released from the structure labeled "9"?

Accepted Answer

A) sarcoplasm 
B) acetylcholine 
C) protein 
D) calcium ions 
E) acetylcholinesterase 
A) sarcoplasm 
B) acetylcholine 
C) protein 
D) calcium ions 
E) acetylcholinesterase

Question 19

Muscle tissue,one of the four basic tissue groups,consists chiefly of cells that are highly specialized for

Accepted Answer

A) conduction. 
B) contraction. 
C) peristalsis. 
D) cushioning. 
E) secretion. 
A) conduction. 
B) contraction. 
C) peristalsis. 
D) cushioning. 
E) secretion.

Question 20

When comparing slow muscle fibers to fast muscle fibers,slow fibers

Accepted Answer

A) take about three times as long to reach peak tension. 
B) have much smaller fiber diameters. 
C) generate much less tension. 
D) are rich in the red protein myoglobin. 
E) All of the answers are correct. 
A) take about three times as long to reach peak tension. 
B) have much smaller fiber diameters. 
C) generate much less tension. 
D) are rich in the red protein myoglobin. 
E) All of the answers are correct.

Exam 10: Muscle Tissue

Which statement about the microscopic anatomy of skeletal muscle fibers is true?

Which of the following statements is false?

In a sarcomere,cross-bridge attachment occurs specifically in the

Active sites on the actin become available for binding after

Fast fibers

The rapid rise and fall in force produced by a muscle fiber after a single action potential is

Interactions between actin and myosin filaments of the sarcomere are responsible for

The region of the sarcomere containing the thick filaments is the

Each skeletal muscle fiber is controlled by a motor neuron at a single

Which of the following statements is (are)true regarding human muscles?

Nerves and blood vessels that service a muscle fiber are located in the connective tissues of its

Figure 10-2 Muscle Contractions Use Figure 10-2 to answer the following question: -To produce a contraction similar to the one in graph (b),the muscle

During the recovery period the body's need for oxygen is increased because

At each end of the muscle,the collagen fibers of the epimysium,and each perimysium and endomysium,come together to form a

A weight-lifter strains to lift a heavy weight and there is no movement of the person's arms holding on to the weight. This type of contraction is called a/an ________ contraction.

Figure 10-1 Skeletal Muscle Fiber Use Figure 10-1 to answer the following question: -Identify the structure where ATP is produced.

Figure 10-2 Muscle Contractions Use Figure 10-2 to answer the following question: -What is the contraction in graph (a)called?

Figure 10-1 Skeletal Muscle Fiber Use Figure 10-1 to answer the following question: -What is released from the structure labeled "9"?

Muscle tissue,one of the four basic tissue groups,consists chiefly of cells that are highly specialized for

When comparing slow muscle fibers to fast muscle fibers,slow fibers

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

Articulations

The Muscular System

Neural Tissue

The Spinal Cord, spinal Nerves, and Spinal Reflexes

The Brain and Cranial Nerves

Neural Integration I: Sensory Pathways and the Somatic Nervous System

Neural Integration Ii: the Autonomic Nervous System and

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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