Question 1

potentials are short- lived,local changes in membrane potential that can be either depolarized or hyperpolarized.

Accepted Answer

The answer of potentials are short- lived,local changes in membrane...

Question 2

How can potentially poisonous gases like NO and CO be used by the body?

Accepted Answer

The answer of How can potentially poisonous gases like NO...

Question 3

Select the correct statement about serial processing.

Accepted Answer

A) Input travels along several different pathways. 
B) Memories are triggered by serial processing. 
C) Spinal reflexes are an example of serial processing. 
D) Smells are processed by serial pathways.

Question 4

Immediately after an action potential has peaked,which cellular gates open?

Accepted Answer

A) potassium 
B) chloride 
C) calcium 
D) sodium

Question 5

The part of a neuron that conducts impulses away from its cell body is called an)_ .

Accepted Answer

A) neurolemma 
B) dendrite 
C) Schwann cell 
D) axon

Question 6

When information is delivered within the CNS simultaneously by different parts of the neural pathway,the process is called _ _ processing.

Accepted Answer

The answer of When information is delivered within the CNS...

Question 7

An inhibitory postsynaptic potential IPSP)is associated with .

Accepted Answer

A) lowering the threshold for an action potential to occur 
B) hyperpolarization 
C) a change in sodium ion permeability 
D) opening of voltage- regulated channels

Question 8

The period after an initial stimulus when a neuron is not sensitive to another stimulus is the .

Accepted Answer

A) repolarization 
B) depolarization 
C) resting period 
D) absolute refractory period

Question 9

Neurons may be classified according to several characteristics.Which of the following is correct?

Accepted Answer

A) Group C fibers are not capable of saltatory conduction. 
B) Group B fibers are highly myelinated and have the highest conduction velocities. 
C) A small cross- sectional area allows shorter conduction times. 
D) Group A fibers are mostly somatic sensory and motor and are the smallest in diameter.

Question 10

The term central nervous system refers to the .

Accepted Answer

A) brain,spinal cord,and peripheral nerves 
B) spinal cord and spinal nerves 
C) brain and spinal cord 
D) autonomic nervous system

Question 11

How can a single axon respond to several different kinds of events?

Accepted Answer

The answer of How can a single axon respond to...

Question 12

Which of the choices below describes the ANS?

Accepted Answer

A) sensory and motor neurons that supply the digestive tract 
B) sensory neurons that convey information from somatic receptors in the head,body wall,and limbs and from receptors from the special senses of vision,hearing,taste,and smell to the CNS 
C) motor fibers that conduct nerve impulses from the CNS to skeletal muscles 
D) motor fibers that conduct nerve impulses from the CNS to smooth muscle,cardiac muscle,and glands

Question 13

Which of the following is not a function of astrocytes?

Accepted Answer

A) anchor neurons to blood vessels 
B) guide the migration of young neurons,synapse formation,and helping to determine capillary permeability 
C) support and brace neurons 
D) provide the defense for the CNS 
E) control the chemical environment around neurons

Question 14

Which of the following is not a function of the autonomic nervous system?

Accepted Answer

A) innervation of cardiac muscle 
B) innervation of glands 
C) innervation of skeletal muscle 
D) innervation of smooth muscle of the digestive tract

Question 15

Which ion channel opens in response to a change in membrane potential and participates in the generation and conduction of action potentials?

Accepted Answer

A) ligand- gated channel 
B) leakage channel 
C) mechanically gated channel 
D) voltage- gated channel

Question 16

What are the basic divisions of the peripheral nervous system?

Accepted Answer

The answer of What are the basic divisions of the...

Question 17

The sheath of Schwann is also called the .

Accepted Answer

A) neurilemma 
B) axolemma 
C) white matter 
D) myelin sheath

Question 18

Neuroglia that control the chemical environment around neurons by buffering potassium and recapturing neurotransmitters are .

Accepted Answer

A) astrocytes 
B) oligodendrocytes 
C) Schwann cells 
D) microglia

Question 19

If a motor neuron in the body were stimulated by an electrode placed about midpoint along the length of the axon _.

Accepted Answer

A) the impulse would move to the axon terminal only 
B) muscle contraction would occur 
C) the impulse would spread bidirectionally 
D) the impulse would move to the axon terminal only,and the muscle contraction would occur

Question 20

are found in the CNS and bind axons and blood vessels to each other.

Accepted Answer

The answer of are found in the CNS and bind...

Exam 11: Fundamentals of the Nervous System and Nervous Tissue