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block

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

Select the correct answer(s).  

(0/0)

---

therapeutic dose.

LD50.

saturated dose.

ED50

none

The basal ganglia are particularly implicated in

Select the correct answer(s).  

(0/0)

---

emotion.

learning and memory.

motor control.

sympathetic nervous system control.

none

The difference in DNA between humans and chimpanzees amounts to

Select the correct answer(s).  

(0/0)

---

2.3%

1.2%

12%

7%

none

Down-regulation is the process by which

Select the correct answer(s).  

(0/0)

---

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

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.

there is an increase in the effectiveness of endogenous neurotransmitters.

none

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

Select the correct answer(s).  

(0/0)

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Lesions of the pineal gland

Exercise

Clozapine

Exposure to high-intensity light

none

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

Select the correct answer(s).  

(0/0)

---

Meissner’s corpuscles.

Pacinian corpuscles.

Merkel’s discs.

Ruffini’s endings.

none

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

Select the correct answer(s).  

(0/0)

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Astrocytes

Schwann cells

Oligodendrocytes

Microglial cells

none

Urine formation is inhibited by

Select the correct answer(s).  

(0/0)

---

AVP.

ADH.

All of the mentioned

vasopressin.

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 answer(s).  

(0/0)

---

hyperpolarization.

generator potential.

sensory reduction.

sensory transduction.

none

A drug that produces a potent schizophrenia-like state is

Select the correct answer(s).  

(0/0)

---

Valium.

chlorpromazine.

LSD.

phencyclidine.

none

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

Select the correct answer(s).  

(0/0)

---

mechanically; sodium

ligand-; chloride

mechanically; calcium

voltage-; potassium

none

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

Select the correct answer(s).  

(0/0)

---

K+.

All of the mentioned.

Cl–.

Na+.

none

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

Select the correct answer(s).  

(0/0)

---

paracrine

autocrine

exocrine

endocrine

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 answer(s).  

(0/0)

---

Acetylcoline

NO

NE

5-HT

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.)

Select the correct answer(s).  

(0/0)

---

Infuse aromatase into that area.

Infuse an estrogen receptor blocker into that area.

Infuse estrogen into that area.

Infuse testosterone into that area.