Chapter 11

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1. 

Direct-acting neurotransmitters ____________.

a. require cyclic AMP

b. mediate very slow responses

c. open ion channels to provoke rapid responses

d. act through second messengers

 

Answer c. (pg. 409)

Direct-acting neurotransmitters open ion channels to provoke rapid responses.

 
2. 

Which of the following is correct relative to Ohm's Law?

a. I = R / V

b. Current is directly proportional to the voltage

c. R = V + 1

d. The more intense the stimulus, the more voltage changes

 

Answer: b (pg. 398)

Which of the following is correct relative to Ohm's Law?

b. Current is directly proportional to the voltage

 
3. 

Ciliated CNS neuroglia that play an active role in moving the cerebrospinal fluid are called _____.

a. ependymal cells

b. Schwann cells

c. oligodendrocytes

d. astrocytes

 

Answer: a (pg.391)

Ciliated CNS neuroglia that play an active role in moving the cerebrospinal fluid are called ependymal cells.

 
4. 

The sheath of Schwann is also called the ____.

a. myelin sheath

b. axolemma

c. neurilemma

d. white matter

 

Answer: c (pg. 394)

The sheath of Schwann is also called the neurilemma.

 
5. 

Bipolar neurons are commonly ________.

a. motor neurons

b. called neuroglial cells

c. found in ganglia

d. found in the retina of the eye

 

Answer: D (pg. 395)

Bipolar neurons are commonly found in the retina of the eye.

 
6. 

An excitatory neurotransmitter secreted by motor neurons innervating skeletal muscle is _____.

a. cholinesterase

b. norepinephrine

c. acetylcholine

d. gamma aminobutyric acid (GABA)

 

Answer: c (pg. 422)

An excitatory neurotransmitter secreted by motor neurons innervating skeletal muscle is acetylcholine.

 
7. 

A neural circuit in which a single impulse is transmitted over and over is a _____.

a. diverging circuit

b. converging circuit

c. reverberating circuit

d. repetitive circuit

 

Answer: c (pg. 422)

A neural circuit in which a single impulse is transmitted over and over is a reverberating circuit.