Question 1

Rabies is caused by a virus that attacks the central nervous system.The virus is normally introduced by an animal bite that breaks the surface of the skin.Since the virus is not motile,how does it travel to the central nervous system?

Accepted Answer

The answer of Rabies is caused by a virus that...

Question 2

Since Jerry's accident,he has had no sensations in his injured leg.Based on the functional classifications of neurons,discuss the type of neuron that has been damaged.Why has he not regained lost nerve function?

Accepted Answer

The answer of Since Jerry's accident,he has had no sensations...

Question 3

Cholinergic synapses use the neurotransmitter:

Accepted Answer

A) norepinephrine. 
B) acetylcholine. 
C) serotonin. 
D) epinephrine.

Question 4

Which neuroglial cell helps form the blood-brain barrier?

Accepted Answer

A) astrocyte 
B) ependymal cell 
C) satellite cell 
D) oligodendrocyte

Question 5

Sarah sensed a mosquito land on her arm and swatted it away with her hand.Which specific PNS division was responsible for the movement of Sarah's hand?

Accepted Answer

A) autonomic nervous system 
B) somatic sensory division 
C) somatic motor division 
D) visceral sensory division

Question 6

What specific type of gated channel opens or closes in response to physical distortion of the membrane surface,such as vibrations or pressure?

Accepted Answer

A) ligand-gated 
B) mechanically-gated 
C) voltage-gated 
D) chemically-gated

Question 7

The porcupinefish produces a toxin that binds voltage-gated sodium channels.Determine the effect of the toxin on nerve function.

Accepted Answer

The answer of The porcupinefish produces a toxin that binds...

Question 8

Summation that results from the cumulative effect of multiple synapses at multiple places on the neuron is designated:

Accepted Answer

A) hyperpolarization. 
B) impulse transmission. 
C) spatial summation. 
D) temporal summation.

Question 9

Place these steps of the action potential in the correct order. 
1)Sodium ions channels return to the resting state and repolarization continues.
2)Voltage-gated sodium ion channels activate,sodium ions enter,and the axon section depolarize
3)As potassium ion channels return to resting state,the axolemma may hyperpolarize before retur to the resting membrane potential.
4)A local potential depolarizes the axolemma of the trigger zone to threshold.
5)Sodium ion channels inactivate,and voltage-gated potassium ion channels activate,so sodium i stop entering and potassium ions leave,beginning repolarization.

Accepted Answer

A) 2,4,5,1,3 
B) 4,2,5,1,3 
C) 4,2,3,5,1 
D) 4,2,1,3,5

Question 10

Neurotransmitters that bind ionotropic receptors control:

Accepted Answer

A) the movement of ions into or out of the postsynaptic neuron. 
B) the formation of a second messenger inside the postsynaptic neuron. 
C) the activation of G-proteins inside the postsynaptic neuron. 
D) some metabolic process inside the postsynaptic neuron.

Question 11

Which neuropeptide neurotransmitter is released from fibers transmitting sensory information about pain and temperature?

Accepted Answer

A) opioids 
B) neuropeptide Y 
C) endorphin 
D) substance P

Question 12

Bipolar neurons have one axon and one dendrite.

Accepted Answer

A) True 
 B)False

Question 13

Explain how leak channels and gated channels differ.

Accepted Answer

The answer of Explain how leak channels and gated channels...

Question 14

Bundles of axons known as tracts are part of the:

Accepted Answer

A) central nervous system. 
B) peripheral nervous system. 
C) myelin sheath. 
D) ganglion.

Question 15

Which of the following is the primary factor in the maintenance of a cell's negative charge during resting membrane potential?

Accepted Answer

A) ligand-gated channels 
B) sodium-potassium pump 
C) leak channels 
D) voltage-gated channels

Question 16

The autonomic nervous system does NOT carry signals to:

Accepted Answer

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

Question 17

The nerve agent,sarin,was developed during World War II to block the effects of acetylcholinesterase.Explain the effects of this nerve agent on the chemical synapse.

Accepted Answer

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Question 18

The sensory,or afferent,division of the peripheral nervous system carries information from the brain and spinal cord to effector organs.

Accepted Answer