Question 1

The sodium gates in the axon are usually closed. Which of the following opens them?

Accepted Answer

A)   depolarization of the membrane
B)   increased concentration of socium outside the cell
C)   increased concentration of sodium inside the cell
D)   increased activity of the sodium-potassium pumpE) None of the above
F) B) and D)

Question 2

There are more glial cells than neurons in the human brain.

Accepted Answer

A) True 
 B)False

Question 3

What would happen to the resting potential if a neuron's membrane was always completely permeable to charged ions?

Accepted Answer

The freedom of movement would ...

Question 4

A membrane produces an action potential whenever the potential across it reaches what level?

Accepted Answer

A)   the resting potential
B)   -90 mV
C)   the threshold of excitation
D)   the refractory periodE) None of the above
F) B) and D)

Question 5

A neuron's sodium gates are firmly closed and the membrane cannot produce an action potential during:

Accepted Answer

A)   the absolute refractory period.
B)   the relative refractory period.
C)   depolarization.
D)   saltatory conduction.E) C) and D)
F) B) and C)

Question 6

Astrocytes remove waste material created when neurons die and control the amount of blood flow to each brain area.

Accepted Answer

A) True 
 B)False

Question 7

When a membrane is at rest, what attracts sodium ions to the inside of the cell?

Accepted Answer

A)   an electrical gradient
B)   a concentration gradient
C)   both an electrical gradient and a concentration gradient
D)   neither an electrical gradient nor a concentration gradientE) C) and D)
F) All of the above

Question 8

Which type of glia remove waste material in the nervous system?

Accepted Answer

A)   astrocytes
B)   Schwann cells
C)   oligodendrocytes
D)   radial gliaE) B) and D)
F) C) and D)

Question 9

What would a neuron in the pons be called that receives information only from other cells in the pons and sends information only to other cells in the pons?

Accepted Answer

A)   afferent
B)   efferent
C)   intrinsic
D)   inter-synapticE) B) and C)
F) B) and D)

Question 10

In the brain, an arrangement of endothelial cells:

Accepted Answer

A)   has gaps large enough to allow the passage of molecules.
B)   synthesizes neurotransmitters.
C)   does not allow most molecules to pass because the cells are so tightly packed.
D)   has gaps that are filled with enzymes that attack most blood chemicals.E) None of the above
F) A) and D)

Question 11

Briefly describe how the brain transports essential chemicals.

Accepted Answer

The brain transports essential chemicals...

Question 12

Multiple sclerosis is one of several:

Accepted Answer

A)   blood-brain disorders
B)   neuron diseases
C)   demyelinating diseases
D)   movement disordersE) None of the above
F) B) and D)

Question 13

Hyperpolarization is:

Accepted Answer

A)   increased polarization.
B)   decreased polarization.
C)   the threshold of the cell.
D)   the resting potential of the cell.E) B) and D)
F) A) and D)

Question 14

The resting potential is mainly the result of:

Accepted Answer

A)   negatively charged proteins inside the cell.
B)   positively charged proteins inside the cell.
C)   negatively charged proteins outside the cell.
D)   positively charged proteins outside the cell.E) A) and B)
F) B) and C)

Question 15

What structure is composed of two layers of fat molecules that are free to flow around one another?

Accepted Answer

A)   the endoplasmic reticulum
B)   a ribosome
C)   a mitochondrion
D)   the membraneE) All of the above
F) B) and C)

Question 16

Molecules that can cross the blood-brain barrier are usually:

Accepted Answer

A)   large, uncharged molecules, such as lactose.
B)   large, charged molecules.
C)   neurotransmitters, such as dopamine.
D)   molecules that can dissolve in the fats of the capillary walls.E) A) and B)
F) A) and C)

Question 17

Oligodendrocytes in the periphery are specialized types of glia.

Accepted Answer

A) True 
 B)False

Question 18

An axon releases chemicals:

Accepted Answer

A)   into the presynaptic terminal.
B)   into the junction between neurons.
C)   through the efferent terminals.
D)   to the mitochondria.E) B) and C)
F) All of the above

Question 19

Incoming synapses are primarily found on:

Accepted Answer

A)   dendrites only.
B)   cell bodies only.
C)   axons only.
D)   dendrites and cell bodies.E) A) and D)
F) None of the above

Question 20

One of the most distinctive features of neurons compared to other types of cells is their:

Accepted Answer

A)   shape.
B)   number of mitochondria.
C)   lack of a cell membrane.
D)   size.E) A) and C)
F) B) and C)

Exam 2: Nerve Cells and Nerve Impulses

What would happen to the resting potential if a neuron's membrane was always completely permeable to charged ions?

Correct AnswerverifiedThe freedom of movement would ...View AnswerShow Answer

Molecules that can cross the blood-brain barrier are usually:

Correct AnswerverifiedShow Answer

One of the most distinctive features of neurons compared to other types of cells is their:

Correct AnswerverifiedShow Answer

What structure is composed of two layers of fat molecules that are free to flow around one another?

Correct AnswerverifiedShow Answer

Briefly describe how the brain transports essential chemicals.

Correct AnswerAnswered by ExamLex AIThe brain transports essential chemicals...View AnswerShow Answer

Multiple sclerosis is one of several:

Correct AnswerverifiedShow Answer

Oligodendrocytes in the periphery are specialized types of glia.

Correct AnswerverifiedShow Answer

A neuron's sodium gates are firmly closed and the membrane cannot produce an action potential during:

Correct AnswerverifiedShow Answer

The resting potential is mainly the result of:

Correct AnswerverifiedShow Answer

The sodium gates in the axon are usually closed. Which of the following opens them?

Correct AnswerverifiedShow Answer

An axon releases chemicals:

Correct AnswerverifiedShow Answer

What would a neuron in the pons be called that receives information only from other cells in the pons and sends information only to other cells in the pons?

Correct AnswerverifiedShow Answer

In the brain, an arrangement of endothelial cells:

Correct AnswerverifiedShow Answer

Astrocytes remove waste material created when neurons die and control the amount of blood flow to each brain area.

Correct AnswerverifiedShow Answer

Hyperpolarization is:

Correct AnswerverifiedShow Answer

A membrane produces an action potential whenever the potential across it reaches what level?

Correct AnswerverifiedShow Answer

Incoming synapses are primarily found on:

Correct AnswerverifiedShow Answer

When a membrane is at rest, what attracts sodium ions to the inside of the cell?

Correct AnswerverifiedShow Answer

There are more glial cells than neurons in the human brain.

Correct AnswerverifiedShow Answer

Which type of glia remove waste material in the nervous system?

Correct AnswerverifiedShow Answer

Correct Answer
verified
The freedom of movement would ...
View Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
Answered by ExamLex AI
The brain transports essential chemicals...
View Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified