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block

Which type of cell is responsible for myelination within the central nervous system?

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Oligodendrocytes

Schwann cells

Microglial cells

Astrocytes

none

A drug that produces a potent schizophrenia-like state is

Select the Correct Answers  

(0/0)

---

chlorpromazine.

phencyclidine.

LSD.

Valium.

none

The difference in DNA between humans and chimpanzees amounts to

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(0/0)

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12%

7%

2.3%

1.2%

none

A cell that releases a hormone that affects the cell next to it is engaged in _______ communication.

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(0/0)

---

autocrine

exocrine

paracrine

endocrine

none

Urine formation is inhibited by

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(0/0)

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vasopressin.

ADH.

AVP.

All of the mentioned

none

Which of the following is an effective treatment for seasonal affective disorder?

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Clozapine

Exposure to high-intensity light

Exercise

Lesions of the pineal gland

none

A local change in the resting potential of a receptor cell that mediates the impact of stimuli and the initiation of nerve impulses is called

Select the Correct Answers  

(0/0)

---

generator potential.

sensory reduction.

hyperpolarization.

sensory transduction.

none

The basal ganglia are particularly implicated in

Select the Correct Answers  

(0/0)

---

emotion.

sympathetic nervous system control.

learning and memory.

motor control.

none

Down-regulation is the process by which

Select the Correct Answers  

(0/0)

---

there is a decrease in the amount of drug necessary for regulation of normal functioning.

an excessive number of transmitter molecules are available to the receptor over a period of time, causing a decrease in the receptor sites that can be counted.

there is an increase in the effectiveness of endogenous neurotransmitters.

an excessive amount of a drug is available to the receptor over a period of time, causing an increase in the receptor sites that can be counted.

none

At the peak of the action potential, the axonal membrane approaches the equilibrium potential for

Select the Correct Answers  

(0/0)

---

All of the mentioned.

K+.

Cl–.

Na+.

none

The Effects of a Drug Depend on Its Site of Action and Dose. The dose at which a drug has a half-maximal response is termed the

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(0/0)

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LD50.

ED50

saturated dose.

therapeutic dose.

none

Stimulation of a Pacinian corpuscle causes the opening of _______ gated _______ channels.

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ligand-; chloride

mechanically; sodium

mechanically; calcium

voltage-; potassium

none

Fast-adapting tactile receptors that mediate most of our ability to perceive form are called

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(0/0)

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Ruffini’s endings.

Meissner’s corpuscles.

Pacinian corpuscles.

Merkel’s discs.

none

After determining normal estrogen levels within a specific brain region, which of the following would show that estrogen is being made by aromatase within that specific brain region? (For all answers below, assume that estrogen will be measured after the manipulation.)

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(0/0)

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Infuse an estrogen receptor blocker into that area.

Infuse testosterone into that area.

Infuse estrogen into that area.

Infuse aromatase into that area.

none

Which of the following neurotransmitters, by acting as a retrograde messenger, has a role in maintaining smooth muscle relaxation, increasing blood flow to the penis, and thereby maintaining erection?

Select the Correct Answers  

(0/0)

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Acetylcoline

NE

5-HT

NO