Question 1

The increase in the number of motor units activated as a result of more intense stimulation is called

Accepted Answer

A)  latency. 
B)  recruitment. 
C)  threshold stimulation. 
D)  sustained contraction. 
A)  latency. 
B)  recruitment. 
C)  threshold stimulation. 
D)  sustained contraction.

Question 2

Myofibrils are composed primarily of

Accepted Answer

A)  actin and myosin. 
B)  perimysium and endomysium. 
C)  troponin and tropomyosin. 
D)  fascia and tendons. 
A)  actin and myosin. 
B)  perimysium and endomysium. 
C)  troponin and tropomyosin. 
D)  fascia and tendons.

Question 3

Myasthenia gravis is

Accepted Answer

A)  an autoimmune disorder. 
B)  a bacterial infection. 
C)  a form of cancer. 
D)  the result of injury. 
A)  an autoimmune disorder. 
B)  a bacterial infection. 
C)  a form of cancer. 
D)  the result of injury.

Question 4

A weightlifter uses muscles so the muscles exert more than 75% of their maximum tension, This stimulates

Accepted Answer

A)  an increase in slow, fatigable white fibers. 
B)  muscle fibers developing new filaments of actin and myosin. 
C)  shrinking of skeletal muscle. 
D)  conversion of skeletal to smooth muscle. 
A)  an increase in slow, fatigable white fibers. 
B)  muscle fibers developing new filaments of actin and myosin. 
C)  shrinking of skeletal muscle. 
D)  conversion of skeletal to smooth muscle.

Question 5

Which of the following is not a muscle of mastication?

Accepted Answer

A)  Medial and lateral pterygoid 
B)  Masseter 
C)  Temporalis 
D)  Zygomaticus 
A)  Medial and lateral pterygoid 
B)  Masseter 
C)  Temporalis 
D)  Zygomaticus

Question 6

In order to stimulate skeletal muscle fibers, motor neurons release the neurotransmitter ______.

Accepted Answer

The answer of In order to stimulate skeletal muscle fibers,...

Question 7

A tendon is ______, whereas an aponeurosis is ______.

Accepted Answer

A)  cordlike and connects bones to bones; a broad sheet of dense connective tissue that connects muscles to muscles 
B)  a broad sheet of dense connective tissue that connects muscles to muscles; cordlike and connects bones to bones 
C)  cordlike and connects muscles to bones; a broad sheet of dense connective tissue that connects muscles to muscles 
D)  a broad sheet of dense connective tissue that connects bones to bones; cordlike and connects muscles to muscles 
A)  cordlike and connects bones to bones; a broad sheet of dense connective tissue that connects muscles to muscles 
B)  a broad sheet of dense connective tissue that connects muscles to muscles; cordlike and connects bones to bones 
C)  cordlike and connects muscles to bones; a broad sheet of dense connective tissue that connects muscles to muscles 
D)  a broad sheet of dense connective tissue that connects bones to bones; cordlike and connects muscles to muscles

Question 8

The amount of oxygen liver cells require to support the conversion of lactic acid to produce glucose or glycogen is the

Accepted Answer

A)  refractory quantity. 
B)  oxygen debt. 
C)  anaerobic concentration. 
D)  aerobic conversion. 
A)  refractory quantity. 
B)  oxygen debt. 
C)  anaerobic concentration. 
D)  aerobic conversion.

Question 9

Smooth muscle lacks

Accepted Answer

A)  actin and myosin. 
B)  transverse tubules and striations. 
C)  myofibrils. 
D)  nuclei and mitochondria. 
A)  actin and myosin. 
B)  transverse tubules and striations. 
C)  myofibrils. 
D)  nuclei and mitochondria.

Question 10

Creatine phosphate

Accepted Answer

A)  causes the decomposition of ATP. 
B)  causes the decomposition of ADP. 
C)  supplies energy for the synthesis of ATP. 
D)  supplies energy for the breakdown of ATP to ADP. 
A)  causes the decomposition of ATP. 
B)  causes the decomposition of ADP. 
C)  supplies energy for the synthesis of ATP. 
D)  supplies energy for the breakdown of ATP to ADP.

Question 11

During muscle contraction ATP supplies energy for

Accepted Answer

A)  creatine phosphate synthesis. 
B)  glycogen synthesis. 
C)  myofilament movement. 
D)  enzyme activity. 
A)  creatine phosphate synthesis. 
B)  glycogen synthesis. 
C)  myofilament movement. 
D)  enzyme activity.

Question 12

The functional unit of muscle contraction is

Accepted Answer

A)  the muscle. 
B)  the muscle fiber. 
C)  the myosin cross-bridge. 
D)  the sarcomere. 
A)  the muscle. 
B)  the muscle fiber. 
C)  the myosin cross-bridge. 
D)  the sarcomere.

Question 13

The muscle that opposes a particular action is called the

Accepted Answer

A)  synergist. 
B)  antagonist. 
C)  agonist. 
D)  prime mover. 
A)  synergist. 
B)  antagonist. 
C)  agonist. 
D)  prime mover.

Question 14

The more movable end of a muscle is its

Accepted Answer

A)  origin. 
B)  fulcrum. 
C)  insertion. 
D)  source. 
A)  origin. 
B)  fulcrum. 
C)  insertion. 
D)  source.

Question 15

Acetylcholine released by the myofibril crosses the synaptic cleft to bind to the motor neuron ending.

Accepted Answer

A) True 
 B)False

Question 16

When a muscle undergoes atrophy in response to disuse

Accepted Answer

A)  there is a reduction in capillary networks. 
B)  the size of actin and myosin filaments decreases. 
C)  the muscle gets smaller. 
D)  all of the above. 
A)  there is a reduction in capillary networks. 
B)  the size of actin and myosin filaments decreases. 
C)  the muscle gets smaller. 
D)  all of the above.

Question 17

__________ degrades acetylcholine, keeping it from accumulating in the synapse.

Accepted Answer

A)  ATPase 
B)  Myosinase 
C)  Actinase 
D)  Acetylcholinesterase 
A)  ATPase 
B)  Myosinase 
C)  Actinase 
D)  Acetylcholinesterase

Question 18

Muscles that assist an agonist are called ______.

Accepted Answer

The answer of Muscles that assist an agonist are called...

Question 19

The type of muscle cell that lacks transverse tubules, has a single nucleus, and is under involuntary control is

Accepted Answer

A)  skeletal muscle. 
B)  smooth muscle. 
C)  cardiac muscle. 
D)  striated muscle. 
A)  skeletal muscle. 
B)  smooth muscle. 
C)  cardiac muscle. 
D)  striated muscle.

Question 20

The discoloration and swelling of a muscle strain is due to

Accepted Answer

A)  excess myofibrils. 
B)  separated tendons. 
C)  severed nerves. 
D)  ruptured blood vessels. 
A)  excess myofibrils. 
B)  separated tendons. 
C)  severed nerves. 
D)  ruptured blood vessels.

Exam 9: Muscular System

The increase in the number of motor units activated as a result of more intense stimulation is called

Myofibrils are composed primarily of

Myasthenia gravis is

A weightlifter uses muscles so the muscles exert more than 75% of their maximum tension, This stimulates

Which of the following is not a muscle of mastication?

In order to stimulate skeletal muscle fibers, motor neurons release the neurotransmitter ______.

A tendon is ______, whereas an aponeurosis is ______.

The amount of oxygen liver cells require to support the conversion of lactic acid to produce glucose or glycogen is the

Smooth muscle lacks

Creatine phosphate

During muscle contraction ATP supplies energy for

The functional unit of muscle contraction is

The muscle that opposes a particular action is called the

The more movable end of a muscle is its

Acetylcholine released by the myofibril crosses the synaptic cleft to bind to the motor neuron ending.

When a muscle undergoes atrophy in response to disuse

__________ degrades acetylcholine, keeping it from accumulating in the synapse.

Muscles that assist an agonist are called ______.

The type of muscle cell that lacks transverse tubules, has a single nucleus, and is under involuntary control is

The discoloration and swelling of a muscle strain is due to

Introduction to Human Anatomy and Physiology

Chemical Basis of Life

Cells

Cellular Metabolism

Tissues

Integumentary System

Skeletal System

Joints of the Skeletal System

Nervous System I: Basic Structure and Function

Nervous System II: Division of the Nervous System

Nervous System III: Senses

Endocrine System

Blood

Cardiovascular System

Lymphatic System and Immunity

Digestive System

Nutrition and Metabolism

Respiratory System

Urinary System

Water, Electrolyte, and Acid-Based Balance

Reproductive Systems

Pregnancy, Growth, and Development

Genetics and Genomics

Filters

A tendon is , whereas an aponeurosis is .