Question 1

Peristalsis is characteristic of smooth muscle.

Accepted Answer

A) True 
 B)False

Question 2

The thin filaments (actin) contain a polypeptide subunit G actin that bears active sites for myosin attachment.

Accepted Answer

A) True 
 B)False

Question 3

What is the primary function of wave summation?

Accepted Answer

A)  produce smooth, continuous muscle contraction 
B)  prevent muscle fatigue 
C)  prevent muscle relaxation 
D)  increase muscle tension 
A)  produce smooth, continuous muscle contraction 
B)  prevent muscle fatigue 
C)  prevent muscle relaxation 
D)  increase muscle tension

Question 4

Aaron arrived at the hospital with the following symptoms: drooping eyelids; fatigue and weakness of his muscles; and difficulty talking, breathing, and swallowing. What was his diagnosis?

Accepted Answer

Aaron probably has myasthenia

Question 5

What part of the sarcolemma contains acetylcholine receptors?

Accepted Answer

A)  end of the muscle fiber 
B)  motor end plate 
C)  part adjacent to another muscle cell 
D)  any part of the sarcolemma 
A)  end of the muscle fiber 
B)  motor end plate 
C)  part adjacent to another muscle cell 
D)  any part of the sarcolemma

Question 6

Which of the following is a factor that affects the velocity and duration of muscle contraction?

Accepted Answer

A)  load on the fiber 
B)  number of muscle fibers stimulated 
C)  size of the muscle fibers stimulated 
D)  muscle length 
A)  load on the fiber 
B)  number of muscle fibers stimulated 
C)  size of the muscle fibers stimulated 
D)  muscle length

Question 7

What is the role of calcium ions in muscle contraction?

Accepted Answer

A)  increase levels of myoglobin 
B)  reestablish glycogen stores 
C)  bind to regulatory sites on troponin to remove contraction inhibition 
D)  form hydroxyapatite crystals 
A)  increase levels of myoglobin 
B)  reestablish glycogen stores 
C)  bind to regulatory sites on troponin to remove contraction inhibition 
D)  form hydroxyapatite crystals

Question 8

The nurse encourages the patient to do his own activities of daily living such as bathing, eating, dressing, and toileting activities. How do these activities promote physical conditioning?

Accepted Answer

These activities are isotonic exercises

Question 9

What structure in skeletal muscle cells functions in calcium storage?

Accepted Answer

A)  myofibrillar network 
B)  mitochondria 
C)  intermediate filament network 
D)  sarcoplasmic reticulum 
A)  myofibrillar network 
B)  mitochondria 
C)  intermediate filament network 
D)  sarcoplasmic reticulum

Question 10

What are caveolae?

Accepted Answer

Folds on the surface

Question 11

Which of the following is not a role of ionic calcium in muscle contraction?

Accepted Answer

A)  activates epinephrine released from adrenal gland 
B)  triggers neurotransmitter secretion 
C)  removes contraction inhibitor 
D)  binds with troponin 
A)  activates epinephrine released from adrenal gland 
B)  triggers neurotransmitter secretion 
C)  removes contraction inhibitor 
D)  binds with troponin

Question 12

Which of the choices below does not describe how excess postexercise oxygen consumption (oxygen deficit) restores metabolic conditions?

Accepted Answer

A)  replaces the oxygen removed from myoglobin 
B)  converts lactic acid back into glycogen stores in the liver 
C)  resynthesizes creatine phosphate and ATP in muscle fibers 
D)  increases the level of lactic acid in the muscle 
A)  replaces the oxygen removed from myoglobin 
B)  converts lactic acid back into glycogen stores in the liver 
C)  resynthesizes creatine phosphate and ATP in muscle fibers 
D)  increases the level of lactic acid in the muscle

Question 13

Three discrete types of muscle fibers are identified on the basis of their size, speed, and endurance. Which of the following athletic endeavors best represents the use of red fibers?

Accepted Answer

A)  gym climbing 
B)  a long, relaxing swim 
C)  playing baseball or basketball 
D)  a sprint by an Olympic runner 
A)  gym climbing 
B)  a long, relaxing swim 
C)  playing baseball or basketball 
D)  a sprint by an Olympic runner

Question 14

What does excess postexercise oxygen consumption represent?

Accepted Answer

A)  the difference between the amount of oxygen needed for totally aerobic muscle activity and the amount actually used 
B)  amount of oxygen needed for aerobic activity to accomplish the same amount of work 
C)  the amount of oxygen equal to the oxygen already used 
D)  the amount of oxygen taken into the body immediately after the exertion 
A)  the difference between the amount of oxygen needed for totally aerobic muscle activity and the amount actually used 
B)  amount of oxygen needed for aerobic activity to accomplish the same amount of work 
C)  the amount of oxygen equal to the oxygen already used 
D)  the amount of oxygen taken into the body immediately after the exertion

Question 15

Briefly explain the sources of energy for a one- minute sustained muscle contraction.

Accepted Answer

1. The first 4- 6 seconds of energy come

Question 16

Briefly, what causes rigor mortis?

Accepted Answer

Following the death of an individual, AT

Question 17

Myoglobin _.

Accepted Answer

A)  is a protein involved in the direct phosphorylation of ADP 
B)  stores oxygen in muscle cells 
C)  produces the end plate potential 
D)  breaks down glycogen 
A)  is a protein involved in the direct phosphorylation of ADP 
B)  stores oxygen in muscle cells 
C)  produces the end plate potential 
D)  breaks down glycogen

Question 18

When a muscle is unable to respond to stimuli temporarily, it is in which of the following periods?

Accepted Answer

A)  relaxation period 
B)  latent period 
C)  refractory period 
D)  fatigue period 
A)  relaxation period 
B)  latent period 
C)  refractory period 
D)  fatigue period

Question 19

What produces the striations of a skeletal muscle cell?

Accepted Answer

A)  a difference in the thickness of the sarcolemma 
B)  the T tubules 
C)  the sarcoplasmic reticulum 
D)  the arrangement of myofilaments 
A)  a difference in the thickness of the sarcolemma 
B)  the T tubules 
C)  the sarcoplasmic reticulum 
D)  the arrangement of myofilaments

Question 20

How is it that norepinephrine (NE) can inhibit smooth muscle action in airways, yet stimulate contractions in smooth muscles everywhere else in the body?

Accepted Answer

Norepinephrine's effects depen

Exam 9: Muscles and Muscle Tissue

Peristalsis is characteristic of smooth muscle.

The thin filaments (actin) contain a polypeptide subunit G actin that bears active sites for myosin attachment.

What is the primary function of wave summation?

Aaron arrived at the hospital with the following symptoms: drooping eyelids; fatigue and weakness of his muscles; and difficulty talking, breathing, and swallowing. What was his diagnosis?

What part of the sarcolemma contains acetylcholine receptors?

Which of the following is a factor that affects the velocity and duration of muscle contraction?

What is the role of calcium ions in muscle contraction?

The nurse encourages the patient to do his own activities of daily living such as bathing, eating, dressing, and toileting activities. How do these activities promote physical conditioning?

What structure in skeletal muscle cells functions in calcium storage?

What are caveolae?

Which of the following is not a role of ionic calcium in muscle contraction?

Which of the choices below does not describe how excess postexercise oxygen consumption (oxygen deficit) restores metabolic conditions?

Three discrete types of muscle fibers are identified on the basis of their size, speed, and endurance. Which of the following athletic endeavors best represents the use of red fibers?

What does excess postexercise oxygen consumption represent?

Briefly explain the sources of energy for a one- minute sustained muscle contraction.

Briefly, what causes rigor mortis?

Myoglobin _.

When a muscle is unable to respond to stimuli temporarily, it is in which of the following periods?

What produces the striations of a skeletal muscle cell?

How is it that norepinephrine (NE) can inhibit smooth muscle action in airways, yet stimulate contractions in smooth muscles everywhere else in the body?

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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