Question 1

Muscle fatigue is a result of

Accepted Answer

A)  accumulation of lactic acid. 
B)  exhaustion of available ATP. 
C)  reduction in lactic acid. 
D)  failure of calcium channels to open after prolonged use. 
E)  inactivity of muscles for prolonged periods of time. 
A)  accumulation of lactic acid. 
B)  exhaustion of available ATP. 
C)  reduction in lactic acid. 
D)  failure of calcium channels to open after prolonged use. 
E)  inactivity of muscles for prolonged periods of time.

Question 2

A motor neuron and the muscle cells it synapses with form a(n)

Accepted Answer

A)  active site. 
B)  action potential. 
C)  motor unit. 
D)  cross bridge. 
E)  motor network. 
A)  active site. 
B)  action potential. 
C)  motor unit. 
D)  cross bridge. 
E)  motor network.

Question 3

Synergist muscles are used to

Accepted Answer

A)  support and stabilize other muscles. 
B)  antagonize muscle groups. 
C)  replace damaged muscles. 
D)  move body parts. 
E)  support organs. 
A)  support and stabilize other muscles. 
B)  antagonize muscle groups. 
C)  replace damaged muscles. 
D)  move body parts. 
E)  support organs.

Question 4

The most common form of muscular dystrophy in adults is

Accepted Answer

A)  myotonic. 
B)  fascioscapulohumeral. 
C)  Becker. 
D)  myoclonic. 
E)  Duchenne. 
A)  myotonic. 
B)  fascioscapulohumeral. 
C)  Becker. 
D)  myoclonic. 
E)  Duchenne.

Question 5

Which proteins are found along the surface of the actin filament?

Accepted Answer

A)  troponin and sequestrin 
B)  calsequestrin and myosin 
C)  tropomyosin and troponin 
D)  acetylcholine and troponin 
E)  albumin and tropomyosin 
A)  troponin and sequestrin 
B)  calsequestrin and myosin 
C)  tropomyosin and troponin 
D)  acetylcholine and troponin 
E)  albumin and tropomyosin

Question 6

A muscle contraction that develops tension but doesn't shorten is

Accepted Answer

A)  isometric. 
B)  isotonic. 
C)  eccentric. 
D)  heliocentric. 
E)  dynamic. 
A)  isometric. 
B)  isotonic. 
C)  eccentric. 
D)  heliocentric. 
E)  dynamic.

Question 7

Each skeletal muscle fiber is also called a

Accepted Answer

A)  muscle. 
B)  muscle cell. 
C)  myofibril. 
D)  sarcomere. 
E)  myomesium. 
A)  muscle. 
B)  muscle cell. 
C)  myofibril. 
D)  sarcomere. 
E)  myomesium.

Question 8

Tetanus is caused by a toxin produced by

Accepted Answer

A)  Clostridium botulinum . 
B)  Clostridium tetani . 
C)  Clostridium perfringens . 
D)  Clostridium welchii . 
E)  Clostridium dificile . 
A)  Clostridium botulinum . 
B)  Clostridium tetani . 
C)  Clostridium perfringens . 
D)  Clostridium welchii . 
E)  Clostridium dificile .

Question 9

The element that is crucial to actual muscle contraction is

Accepted Answer

A)  sodium. 
B)  potassium. 
C)  iron. 
D)  magnesium. 
E)  calcium. 
A)  sodium. 
B)  potassium. 
C)  iron. 
D)  magnesium. 
E)  calcium.

Question 10

Myosin heads contain

Accepted Answer

A)  actin. 
B)  myofibrils. 
C)  ATP 
D)  ADP 
E)  ATPase. 
A)  actin. 
B)  myofibrils. 
C)  ATP 
D)  ADP 
E)  ATPase.

Question 11

During muscle contractions

Accepted Answer

A)  the myofibrils lengthen. 
B)  the actin and myosin filaments slide over each other. 
C)  the actin filaments move away from the middle of the sarcomere during contraction and toward on relaxation. 
D)  the muscle thins. 
E)  ATP is produced. 
A)  the myofibrils lengthen. 
B)  the actin and myosin filaments slide over each other. 
C)  the actin filaments move away from the middle of the sarcomere during contraction and toward on relaxation. 
D)  the muscle thins. 
E)  ATP is produced.

Question 12

A cancer that develops in muscle is

Accepted Answer

A)  malignant melanoma. 
B)  oat cell carcinoma. 
C)  giant cell carcinoma. 
D)  rhabdomyosarcoma. 
E)  Wilm's tumor. 
A)  malignant melanoma. 
B)  oat cell carcinoma. 
C)  giant cell carcinoma. 
D)  rhabdomyosarcoma. 
E)  Wilm's tumor.

Question 13

Repeated stimulation of a motor unit over a short period of time leads to

Accepted Answer

A)  fatigue. 
B)  tetanus. 
C)  increased muscle strength. 
D)  muscle twitch. 
E)  increased ATP production. 
A)  fatigue. 
B)  tetanus. 
C)  increased muscle strength. 
D)  muscle twitch. 
E)  increased ATP production.

Question 14

Selecting the Exception Four of the five answers listed below are molecules that participate in muscle contraction. Select the exception.

Accepted Answer

A)  sarcolemma 
B)  ATP 
C)  calcium 
D)  actin 
E)  myosin 
A)  sarcolemma 
B)  ATP 
C)  calcium 
D)  actin 
E)  myosin

Question 15

White muscles are designed to contract

Accepted Answer

A)  quickly. 
B)  quickly and for short periods. 
C)  slowly. 
D)  slowly for short periods. 
E)  slowly for long periods. 
A)  quickly. 
B)  quickly and for short periods. 
C)  slowly. 
D)  slowly for short periods. 
E)  slowly for long periods.

Question 16

What contributes to muscle fatigue?

Accepted Answer

A)  lactic acid buildup 
B)  glycogen depletion 
C)  both lactic acid buildup and glycogen depletion 
D)  loss of nerve innervation 
E)  stretching a muscle 
A)  lactic acid buildup 
B)  glycogen depletion 
C)  both lactic acid buildup and glycogen depletion 
D)  loss of nerve innervation 
E)  stretching a muscle

Question 17

What is the term for the sudden and involuntary contraction of a muscle?

Accepted Answer

A)  spasm 
B)  twitch 
C)  tetanus 
D)  treppe 
E)  paralysis 
A)  spasm 
B)  twitch 
C)  tetanus 
D)  treppe 
E)  paralysis

Question 18

The most immediate source of energy for reformation of ATP in muscle cells is

Accepted Answer

A)  aerobic respiration. 
B)  mitochondrial pathways. 
C)  electron transport phosphorylation. 
D)  creatine phosphate. 
E)  anaerobic fermentation. 
A)  aerobic respiration. 
B)  mitochondrial pathways. 
C)  electron transport phosphorylation. 
D)  creatine phosphate. 
E)  anaerobic fermentation.

Question 19

In which system are all three types of muscles involved in homeostasis?

Accepted Answer

A)  respiratory 
B)  digestive 
C)  urinary 
D)  reproductive 
E)  cardiovascular 
A)  respiratory 
B)  digestive 
C)  urinary 
D)  reproductive 
E)  cardiovascular

Question 20

The most common form of muscular dystrophy in children is

Accepted Answer

A)  myotonic. 
B)  fascioscapulohumeral. 
C)  Becker. 
D)  myoclonic. 
E)  Duchenne. 
A)  myotonic. 
B)  fascioscapulohumeral. 
C)  Becker. 
D)  myoclonic. 
E)  Duchenne.

Exam 6: The Muscular System

Muscle fatigue is a result of

A motor neuron and the muscle cells it synapses with form a(n)

Synergist muscles are used to

The most common form of muscular dystrophy in adults is

Which proteins are found along the surface of the actin filament?

A muscle contraction that develops tension but doesn't shorten is

Each skeletal muscle fiber is also called a

Tetanus is caused by a toxin produced by

The element that is crucial to actual muscle contraction is

Myosin heads contain

During muscle contractions

A cancer that develops in muscle is

Repeated stimulation of a motor unit over a short period of time leads to

Selecting the Exception Four of the five answers listed below are molecules that participate in muscle contraction. Select the exception.

White muscles are designed to contract

What contributes to muscle fatigue?

What is the term for the sudden and involuntary contraction of a muscle?

The most immediate source of energy for reformation of ATP in muscle cells is

In which system are all three types of muscles involved in homeostasis?

The most common form of muscular dystrophy in children is

Learning About Human Biology

Chemistry of Life

Cells and How They Work

Tissues, Organs, and Organ Systems

The Skeletal System

Circulation: the Heart and Blood Vessels

Blood

Immunity and Disease

The Respiratory System

Digestion and Nutrition

The Urinary System

The Nervous System

Sensory Systems

The Endocrine System

Reproductive Systems

Development and Aging

Cell Reproduction

Introduction to Genetics

Chromosomes and Human Genetics

DNA, Genes, and Biotechnology

Genes and Disease: Cancer

Principles of Evolution

Principles of Ecology

Human Impacts on the Biosphere

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