A nerve is

Question 1A nerve is

 

any cell located in the brain or spinal region.

 

a neuron.

 

a part of the central nervous system.

 

composed of sensory axons and motor dendrites.

 

composed of the long fibers of long axons.

 

Question 2A postsynaptic membrane

 

can be a myelin sheath.

 

can be a dendrite membrane.

 

can be an axon membrane.

 

can be a cell body membrane.

 

can be all of the answer choices, except being a myelin sheath.

 

Question 3Saltatory conduction occurs when

 

salt (or sodium) levels are highest.

 

the action potential jumps from node to node.

 

the resting potential fails to be reset.

 

the sodium (salt) gates open.

 

there is no synapse and the axon is continuous with the next dendrite.

 

Question 4The difference between a weak stimulus and an intense stimulus is

 

a strong stimulus does not allow repolarization, but sends a constant flow of ions.

 

an intense stimulus causes more sodium ions to diffuse into the cell.

 

the action potential is gradated and a weak stimulus causes a small change in polarity.

 

the axon fires at a greater frequency for an intense stimulus.

 

weak stimuli only open sodium gates, and strong stimuli also open potassium gates.

 

Question 5The membranes that protect the brain and spinal cord are called

 

gray matter.

 

meninges.

 

cerebrospinal membranes.

 

ventricles.

 

epithelium.

 

Question 6The summing up of excitatory and inhibitory signals in a neuron is called

 

synapse.

 

sympathetic response.

 

repolarization.

 

synaptic integration.

 

inhibition.

 

Question 7When the dorsal root of a spinal nerve is cut,

 

outgoing motor nerve impulses are lost.

 

incoming motor nerve impulses are lost.

 

impulses do not cross over to the other side of the body.

 

the organism is killed.

 

incoming sensory nerve impulses are lost.

 

Question 8Which of the following is NOT true about the cerebrum?

 

The two cerebral hemispheres are connected by the corpus callosum.

 

It is responsible for maintenance of breathing and heart rate.

 

It is the largest part of the human brain.

 

Association areas integrate information from different lobes.

 

The gray matter is the outermost.

 

Question 9Which of the following is not a symptom of addiction to a certain drug?

 

It takes more drug to cause the same changes as before.

 

The drug continues to cause physical or psychological changes in your body.

 

You spend more and more time trying to get the drug and/or thinking about using the drug.

 

You cannot function without having the drug.

 

You quit eating as long as you can use the drug.

 

Question 10Which statement is NOT true about the development of an action potential?

 

Depolarization occurs when sodium gates open and allow sodium ions to enter the cell.

 

The action potential ends when the polarity across the membrane reaches +40 mV.

 

There is a rapid change in polarity from about -65 mV to about +40 mV.

 

Potassium gates open after the sodium gates and allow potassium ions to leave the cell.

 

It requires two types of gated channels

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