Question 1

Which of the following is not characteristic of smooth muscle?

Accepted Answer

A) Smooth muscle connective tissue forms tendons and aponeuroses. 
B) Neurons that innervate smooth muscles are under involuntary control. 
C) Smooth muscle cells are uninucleate. 
D) Smooth muscles do not contain sarcomeres. 
E) The thin filaments of smooth muscle fibers are attached to dense bodies. 
A) Smooth muscle connective tissue forms tendons and aponeuroses. 
B) Neurons that innervate smooth muscles are under involuntary control. 
C) Smooth muscle cells are uninucleate. 
D) Smooth muscles do not contain sarcomeres. 
E) The thin filaments of smooth muscle fibers are attached to dense bodies. A

Question 2

Cross bridge detachment is caused by ________ binding to the myosin head.

Accepted Answer

ATP

Question 3

A hypothetical genetic disease causes the body to produce antibodies that compete with acetylcholine for receptors on the motor end plate.Patients with this disease exhibit varying degrees of muscle weakness and flaccid paralysis in the affected muscles.If you could administer a drug that inhibits acetylcholinesterase or a drug that blocks acetylcholine,which one would you use to alleviate these symptoms?

Accepted Answer

This is a case of competition between acetylcholine and the antibody.To make the patient's acetylcholine more effective,a drug that inhibits acetylcholinesterase would slow the breakdown of his acetylcholine,relieving some of the weakness.An acetylcholine blocker would be worse than doing nothing.

Question 4

When calcium ion binds to troponin,

Accepted Answer

A) tropomyosin moves into the groove between the helical actin strands. 
B) active sites on the myosin are exposed. 
C) actin heads will bind to myosin. 
D) muscle relaxation occurs. 
E) myosin shortens. 
A) tropomyosin moves into the groove between the helical actin strands. 
B) active sites on the myosin are exposed. 
C) actin heads will bind to myosin. 
D) muscle relaxation occurs. 
E) myosin shortens.

Question 5

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

Accepted Answer

A) It is getting stronger with exercise. 
B) There is a gradual increase in the concentration of calcium ions 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 getting stronger with exercise. 
B) There is a gradual increase in the concentration of calcium ions 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 6

Which of the following become connected by myosin cross-bridges during muscle contraction?

Accepted Answer

A) thin filaments and thick filaments 
B) thick filaments and titin filaments 
C) z disks and actin filaments 
D) thick filaments and t-tubules 
E) thin filaments and t-tubules 
A) thin filaments and thick filaments 
B) thick filaments and titin filaments 
C) z disks and actin filaments 
D) thick filaments and t-tubules 
E) thin filaments and t-tubules

Question 7

Because skeletal muscle contractions demand large quantities of ATP,skeletal muscles have

Accepted Answer

A) a rich nerve supply. 
B) a rich blood supply and few mitochondria 
C) abundant mitochondria and a poor blood supply. 
D) adipose tissue between fibers to supply nutrients for ATP production. 
E) many mitochondria and a rich blood supply. 
A) a rich nerve supply. 
B) a rich blood supply and few mitochondria 
C) abundant mitochondria and a poor blood supply. 
D) adipose tissue between fibers to supply nutrients for ATP production. 
E) many mitochondria and a rich blood supply.

Question 8

During the Cori cycle,in the liver

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 9

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

Question 10

In response to action potentials arriving along the transverse tubules,the sarcoplasmic reticulum releases

Accepted Answer

A) acetylcholine. 
B) sodium ions. 
C) potassium ions. 
D) calcium ions. 
E) hydrogen ions. 
A) acetylcholine. 
B) sodium ions. 
C) potassium ions. 
D) calcium ions. 
E) hydrogen ions.

Question 11

In a sarcomere,thick filaments are linked laterally by proteins of 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 12

Which of the following is a recognized function of skeletal muscle?

Accepted Answer

A) produce movement 
B) maintain posture 
C) maintain body temperature 
D) guard body entrances and exits 
E) All of the answers are correct. 
A) produce movement 
B) maintain posture 
C) maintain body temperature 
D) guard body entrances and exits 
E) All of the answers are correct.

Question 13

Which of these would lead to increased oxygen consumption?

Accepted Answer

A) increased heat production 
B) increased conversion of lactic acid to glucose 
C) increased aerobic respiration by muscle cells 
D) increased muscle activity 
E) All of the answers are correct. 
A) increased heat production 
B) increased conversion of lactic acid to glucose 
C) increased aerobic respiration by muscle cells 
D) increased muscle activity 
E) All of the answers are correct.

Question 14

In rigor mortis

Accepted Answer

A) the myosin heads are attached to actin. 
B) ATP is depleted. 
C) muscles are inextensible. 
D) cross-bridge cycling is absent. 
E) All of the answers are correct. 
A) the myosin heads are attached to actin. 
B) ATP is depleted. 
C) muscles are inextensible. 
D) cross-bridge cycling is absent. 
E) All of the answers are correct.

Question 15

Which type of muscle fibers are best adapted for prolonged contraction such as standing all day?

Accepted Answer

A) uninucleated fibers 
B) striated fibers 
C) fast fibers 
D) slow fibers 
E) intermediate fibers 
A) uninucleated fibers 
B) striated fibers 
C) fast fibers 
D) slow fibers 
E) intermediate fibers

Question 16

Figure 10-2 Muscle Contractions
Use Figure 10-2 to answer the following question:
-Why is there partial relaxation in graph (c)?

Accepted Answer

A) Calcium ion release is slow. 
B) The muscle is starting to fatigue. 
C) Stimulation intensity is fluctuating. 
D) ATP reserves are cycling. 
E) Nerve stimulation frequency is below maximum. 
A) Calcium ion release is slow. 
B) The muscle is starting to fatigue. 
C) Stimulation intensity is fluctuating. 
D) ATP reserves are cycling. 
E) Nerve stimulation frequency is below maximum.

Question 17

A patient takes a medication that blocks ACh receptors of skeletal muscle fibers. What is this drug's effect on skeletal muscle contraction?

Accepted Answer

A) increases tone in the muscle 
B) causes a strong contraction similar to a "charlie horse" cramp 
C) increases the muscle's excitability 
D) produces a strong,continuous state of contraction 
E) reduces the muscle's ability for contraction 
A) increases tone in the muscle 
B) causes a strong contraction similar to a "charlie horse" cramp 
C) increases the muscle's excitability 
D) produces a strong,continuous state of contraction 
E) reduces the muscle's ability for contraction

Question 18

When contraction occurs,

Accepted Answer

A) the H bands get smaller. 
B) the Z lines move closer together. 
C) the width of the A band remains constant. 
D) the I bands get smaller. 
E) All of the answers are correct. 
A) the H bands get smaller. 
B) the Z lines move closer together. 
C) the width of the A band remains constant. 
D) the I bands get smaller. 
E) All of the answers are correct.

Question 19

When a skeletal muscle fiber contracts,

Accepted Answer

A) the H bands and I bands get smaller. 
B) the zones of overlap get larger. 
C) the Z lines get closer together. 
D) the width of the A band remains constant. 
E) All of the answers are correct. 
A) the H bands and I bands get smaller. 
B) the zones of overlap get larger. 
C) the Z lines get closer together. 
D) the width of the A band remains constant. 
E) All of the answers are correct.

Question 20

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.

Exam 10: Muscle Tissue

Which of the following is not characteristic of smooth muscle?

Cross bridge detachment is caused by ________ binding to the myosin head.

When calcium ion binds to troponin,

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

Which of the following become connected by myosin cross-bridges during muscle contraction?

Because skeletal muscle contractions demand large quantities of ATP,skeletal muscles have

During the Cori cycle,in the liver

Which of the following best describes the term sarcoplasmic reticulum?

In response to action potentials arriving along the transverse tubules,the sarcoplasmic reticulum releases

In a sarcomere,thick filaments are linked laterally by proteins of the

Which of the following is a recognized function of skeletal muscle?

Which of these would lead to increased oxygen consumption?

In rigor mortis

Which type of muscle fibers are best adapted for prolonged contraction such as standing all day?

Figure 10-2 Muscle Contractions Use Figure 10-2 to answer the following question: -Why is there partial relaxation in graph (c)?

A patient takes a medication that blocks ACh receptors of skeletal muscle fibers. What is this drug's effect on skeletal muscle contraction?

When contraction occurs,

When a skeletal muscle fiber contracts,

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

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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