Question 1

-The letter B in this figure points to

Accepted Answer

A)  the A band. 
B)  the M line. 
C)  a sarcomere. 
D)  the I band. 
E)  a Z disk. 
A)  the A band. 
B)  the M line. 
C)  a sarcomere. 
D)  the I band. 
E)  a Z disk.

Question 2

The major abductor of the upper limb is the

Accepted Answer

A)  trapezius. 
B)  latissimus dorsi. 
C)  deltoid. 
D)  pectoralis major. 
E)  biceps brachii. 
A)  trapezius. 
B)  latissimus dorsi. 
C)  deltoid. 
D)  pectoralis major. 
E)  biceps brachii.

Question 3

Most types of nerve gas exert their effect by inactivating acetylcholinesterase. One of the antidotes for nerve gas is atropine, which is also a poison. Although it may seem strange to have one poison counteract the effects of another poison, which of the following suggestions might be accurate for the effect that atropine has on the neuromuscular junction?

Accepted Answer

A)  Atropine increases the production of acetylcholine in the synaptic vesicles. 
B)  Atropine increases the release of acetylcholine across the synaptic cleft. 
C)  Atropine increases the number of receptor sites for acetylcholine on the muscle cell membrane. 
D)  Atropine attaches to receptor sites for acetylcholine on the muscle cell membrane. 
E)  Atropine increases both the release of acetylcholine and the number of available receptor sites. 
A)  Atropine increases the production of acetylcholine in the synaptic vesicles. 
B)  Atropine increases the release of acetylcholine across the synaptic cleft. 
C)  Atropine increases the number of receptor sites for acetylcholine on the muscle cell membrane. 
D)  Atropine attaches to receptor sites for acetylcholine on the muscle cell membrane. 
E)  Atropine increases both the release of acetylcholine and the number of available receptor sites.

Question 4

The condition in which a muscle remains contracted between stimuli without relaxing is called

Accepted Answer

A)  recruitment. 
B)  tetanus. 
C)  the all-or-none response. 
D)  a motor unit. 
E)  the lag phase. 
A)  recruitment. 
B)  tetanus. 
C)  the all-or-none response. 
D)  a motor unit. 
E)  the lag phase.

Question 5

Contractibility is the ability of skeletal muscle to

Accepted Answer

A)  shorten with force. 
B)  lengthen passively. 
C)  respond to a stimulus. 
D)  recoil to their original resting length. 
E)  be stretched. 
A)  shorten with force. 
B)  lengthen passively. 
C)  respond to a stimulus. 
D)  recoil to their original resting length. 
E)  be stretched.

Question 6

Organophospahtes cause spastic paralysis because:

Accepted Answer

A)  their action produces a constant stimulus to contract 
B)  they inhibit the activity of acetylcholinesterase 
C)  they prevent the degradation of acetylcholine in the neuromuscular junction 
D)  they prevent the muscles from relaxing 
E)  all of these are true 
A)  their action produces a constant stimulus to contract 
B)  they inhibit the activity of acetylcholinesterase 
C)  they prevent the degradation of acetylcholine in the neuromuscular junction 
D)  they prevent the muscles from relaxing 
E)  all of these are true

Question 7

What ensures that one action potential in the neuron yields only one action potential in the skeletal muscle fibers of the stimulated motor unit and therefore only one contraction per fiber?

Accepted Answer

A)  the amount of calcium that enters the pre-synaptic cell 
B)  the rate of diffusion of acetylcholine across the synaptic cleft 
C)  the number of muscle fibers that make up the motor unit 
D)  enzymatic breakdown of acetylcholine by acetylcholinesterase 
E)  All of these ensure this one to one ratio. 
A)  the amount of calcium that enters the pre-synaptic cell 
B)  the rate of diffusion of acetylcholine across the synaptic cleft 
C)  the number of muscle fibers that make up the motor unit 
D)  enzymatic breakdown of acetylcholine by acetylcholinesterase 
E)  All of these ensure this one to one ratio.

Question 8

A single motor neuron and all the skeletal muscle fibers it innervates is called a

Accepted Answer

A)  neuromuscular junction. 
B)  synaptic cleft. 
C)  motor unit. 
D)  synapse. 
E)  presynaptic terminal. 
A)  neuromuscular junction. 
B)  synaptic cleft. 
C)  motor unit. 
D)  synapse. 
E)  presynaptic terminal.

Question 9

In muscles, a high-energy molecule that can be quickly used to produce ATP is

Accepted Answer

A)  creatine phosphate. 
B)  glucose. 
C)  carbon dioxide. 
D)  lactic acid. 
E)  water. 
A)  creatine phosphate. 
B)  glucose. 
C)  carbon dioxide. 
D)  lactic acid. 
E)  water.

Question 10

The constant tension produced by muscles for long periods of time is ___________.

Accepted Answer

A)  potential energy 
B)  muscle tone 
C)  myofibril energy 
D)  muscle energy 
A)  potential energy 
B)  muscle tone 
C)  myofibril energy 
D)  muscle energy

Question 11

"Pull-ups" are easier to do with the hands supinated than with the hands pronated. An explanation for this is

Accepted Answer

A)  the biceps brachii is attached to the radial tuberosity. 
B)  the biceps brachii supinates the forearm. 
C)  if the forearm is pronated, the biceps brachii is ineffective in flexing the forearm. 
D)  the brachialis is a much smaller muscle than the biceps brachii. 
E)  All of these contribute to a full and proper explanation. 
A)  the biceps brachii is attached to the radial tuberosity. 
B)  the biceps brachii supinates the forearm. 
C)  if the forearm is pronated, the biceps brachii is ineffective in flexing the forearm. 
D)  the brachialis is a much smaller muscle than the biceps brachii. 
E)  All of these contribute to a full and proper explanation.

Question 12

Which of the following statements is FALSE?

Accepted Answer

A)  The resting potential of a cell develops because the cell membrane is more permeable to K+ than it is to most other ions. 
B)  The concentration of Na+ is higher inside the cell than outside. 
C)  Potassium ions only diffuse down their gradient until the charge difference across the membrane is great enough (electrical equilibrium) to prevent additional diffusion. 
D)  Potassium's tendency to diffuse out is opposed by the attractive forces of the negative charge inside the cell. 
E)  The sodium-potassium exchange pump maintains the normal resting concentrations of ions on either side of the cell membrane. 
A)  The resting potential of a cell develops because the cell membrane is more permeable to K+ than it is to most other ions. 
B)  The concentration of Na+ is higher inside the cell than outside. 
C)  Potassium ions only diffuse down their gradient until the charge difference across the membrane is great enough (electrical equilibrium) to prevent additional diffusion. 
D)  Potassium's tendency to diffuse out is opposed by the attractive forces of the negative charge inside the cell. 
E)  The sodium-potassium exchange pump maintains the normal resting concentrations of ions on either side of the cell membrane.

Question 13

The biceps brachii muscle and the triceps brachii muscle

Accepted Answer

A)  are synergists. 
B)  are antagonists. 
C)  both flex the forearm. 
D)  are both antagonists and flexors of the forearm. 
E)  are both synergists and flexors of the forearm. 
A)  are synergists. 
B)  are antagonists. 
C)  both flex the forearm. 
D)  are both antagonists and flexors of the forearm. 
E)  are both synergists and flexors of the forearm.

-The letter B in this figure points to

The major abductor of the upper limb is the

The condition in which a muscle remains contracted between stimuli without relaxing is called

Contractibility is the ability of skeletal muscle to

Organophospahtes cause spastic paralysis because:

What ensures that one action potential in the neuron yields only one action potential in the skeletal muscle fibers of the stimulated motor unit and therefore only one contraction per fiber?

A single motor neuron and all the skeletal muscle fibers it innervates is called a

In muscles, a high-energy molecule that can be quickly used to produce ATP is

The constant tension produced by muscles for long periods of time is ___________.

"Pull-ups" are easier to do with the hands supinated than with the hands pronated. An explanation for this is

Which of the following statements is FALSE?

The biceps brachii muscle and the triceps brachii muscle

The Human Organism

The Chemical Basis of Life

Cell Structures and Their Functions

Tissuesasis of Life

Integumentary System

Skeletal System: Bones and Joints

Nervous System

Senses

Endocrine System

Blood

Heart

Blood Vessels and Circulation

The Lymphatic System and Immunity

Respiratory System

Digestive System

Nutrition, Metabolism, and Body Temperature Regulation

Urinary System and Fluid Balance

Reproductive System

Development, Heredity, and Aging

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Exam 7: Muscular System

-The letter B in this figure points to

The major abductor of the upper limb is the

The condition in which a muscle remains contracted between stimuli without relaxing is called

Contractibility is the ability of skeletal muscle to

Organophospahtes cause spastic paralysis because:

What ensures that one action potential in the neuron yields only one action potential in the skeletal muscle fibers of the stimulated motor unit and therefore only one contraction per fiber?

A single motor neuron and all the skeletal muscle fibers it innervates is called a

In muscles, a high-energy molecule that can be quickly used to produce ATP is

The constant tension produced by muscles for long periods of time is ___________.

"Pull-ups" are easier to do with the hands supinated than with the hands pronated. An explanation for this is

Which of the following statements is FALSE?

The biceps brachii muscle and the triceps brachii muscle

The Human Organism

The Chemical Basis of Life

Cell Structures and Their Functions

Tissuesasis of Life

Integumentary System

Skeletal System: Bones and Joints

Nervous System

Senses

Endocrine System

Blood

Heart

Blood Vessels and Circulation

The Lymphatic System and Immunity

Respiratory System

Digestive System

Nutrition, Metabolism, and Body Temperature Regulation

Urinary System and Fluid Balance

Reproductive System

Development, Heredity, and Aging

Filters