Questions about the Nervous System


1. The resting potential of a neuron is about __________ mV.

 

          a. 0 

          b. - 55 

          c. - 70 

          d. - 100


2. A graded potential occurs when _____________.

 

a. a neurotransmitter binds to a receptor on the dendrites or cell body and causes depolarization

b. a neurotransmitter binds to a receptor on the dendrites or cell body and causes repolarization

          c. a neurotransmitter binds to a receptor on the axon and causes depolarization

          d. a neurotransmitter binds to a receptor on the axon and causes repolarization


3. Which of these statements is true?

 

a. A single neuron can carry both information going to the brain and information coming from the brain, but a nerve can only carry information in one direction.

b. A single neuron can only carry information in one direction, but a nerve can carry both information going to the brain and information coming from the brain.

          c. Both neurons and nerves can carry information in only one direction.

d. Both neurons and nerves can carry both information going to the brain and information coming from the brain.


4. During repolarization ________________.


          a. potassium enters an axon and the inside of the cell becomes less negative

          b. potassium enters an axon and the inside of the cell becomes more negative

          c. potassium leaves an axon and the inside of the cell becomes less negative

          d. potassium leaves an axon and the inside of the cell becomes more negative


5. Select the correct statement.

 

          a. All action potentials are identical. 

b. The brain identifies the type of message coming to it because of where the message comes from and where it goes in the brain.

c. The brain knows the intensity of a message by the number of action potentials reaching it per time.

          d. All of these are correct.


6. To make the information travel faster through your body, your neurons ___________.

 

          a. are very large 

          b. are wrapped with myelin

          c. are made of gray matter 

          d. all of these


7. Depolarization is caused by ___________.

 

          a. Sodium ions rushing into the axon 

          b. Sodium ions rushing out of the axon

          c. Potassium ions rushing into the axon 

          d. Potassium ions rushing out of the axon


8. Choose which of the following applies to the sympathetic nervous system.

 

          a. It stimulates digestion. 

          b. It is called the rest-and-digest system.

          c. It increases heart rate. 

          d. All of these


9. The part of the brain you use for thinking is the ________________.

 

          a. autonomic nervous system 

          b. cerebrum

          c. cerebellum 

          d. medulla oblongata


10. Select the correct statement.


          a. All action potentials are identical.

b. Some neurons have small action potentials and others have big action potentials.

c. Strong stimuli cause big action potentials and weak stimuli cause small action potentials.

          d. No two action potentials are alike.


11. The brain is part of the ______________ nervous system.

 

          a. autonomic motor 

          b. central 

          c. sensory 

          d. somatic motor


12. The function of the sodium/potassium pump on an axon is to ____________.

 

          a. produce action potentials 

          b. produce graded potentials

          c. make neurotransmitters 

          d. pump sodium out and potassium into an axon