Question 1

An unmyelinated fiber with a large diameter can conduct action potentials more rapidly than an unmyelinated fiber with a smaller diameter.

Accepted Answer

A) True 
 B)False

Question 2

Indicate whether the membrane is more permeable to K⁺ or to Na⁺ or is equally permeable to these ions under the stated conditions:
a.more permeable to K+ than to Na+
b.more permeable to Na+ than to K+
c.equally permeable to Na+ and K+
-At resting potential

Accepted Answer

The answer of Indicate whether the membrane is more permeable...

Question 3

Schwann cells stimulate the formation of a(n) ____________________ tube to rebuild damaged neurons.

Accepted Answer

The answer of Schwann cells stimulate the formation of a(n)...

Question 4

Threshold potential is the peak potential achieved during an action potential.

Accepted Answer

A) True 
 B)False

Question 5

A balance of IPSPs and EPSPs will negate each other so that the grand postsynaptic potential is essentially unaltered.

Accepted Answer

A) True 
 B)False

Question 6

All of the following may be considered second messengers except

Accepted Answer

A) inositol triphosphate 
B) calcium ions 
C) phosphodiesterase 
D) cyclic AMP 
E) diacylglycerol

Question 7

Use this figure to answer the corresponding questions.
-Label "3" is
a.a second messenger
b.a kinase protein
c.a G protein
d.a G protein coupled receptor
e.an effector enzyme

Accepted Answer

The answer of  
Use this figure to answer the...

Question 8

Match neural disease/influence with correct characteristic.
a.multiple sclerosis
b.tetanus
c.strychnine
d.roseola
e.Parkinson's disease
-Destroys myelin

Accepted Answer

The answer of Match neural disease/influence with correct characteristic.
a.multiple sclerosis
b.tetanus
c.strychnine
d.roseola
e.Parkinson's...

Question 9

G proteins in the plasma membrane of certain cells may become activated in response to the binding of water-soluble hormones, whereas protein phosphatases are continuously active in these cells.

Accepted Answer

A) True 
 B)False

Question 10

Presynaptic inhibition is brought about when dendrites of a postsynaptic neuron alter the signals sent from an axon terminal of a presynaptic neuron.

Accepted Answer

A) True 
 B)False

Question 11

The negative charge established along the cytosolic border a nerve cell membrane is due to

Accepted Answer

A) movement of sodium ions into the cell 
B) movement of proteins out of the cell 
C) higher permeability of K+ relative to Na+ 
D) movement of proteins through membrane channels 
E) both b and d

Question 12

Preprohormones give rise to lipophilic hormones.

Accepted Answer

A) True 
 B)False

Question 13

Select the neuropeptide.

Accepted Answer

A) acetylcholine 
B) dopamine 
C) epinephrine 
D) cholecystokinin 
E) glycine

Question 14

An IPSP is

Accepted Answer

A) produced by increased permeability to Na+ and K+ 
B) produced by increased permeability to K+ or Cl- 
C) a hyperpolarization of the presynaptic cell 
D) a decrease in the postsynaptic membrane potential 
E) an decrease in the presynaptic membrane potential

Question 15

Drugs may influence synaptic transmission by

Accepted Answer

A) altering the formation of neurotransmitters 
B) blocking neurotransmitter reuptake 
C) blocking receptors 
D) blocking channels 
E) all of the above

Question 16

Use the answer code below to answer this section.
a.increased PNa+ and no change in PK+
b.decreased PNa+ and decreased PK+
c.increased PK+ and no change in PNa+
d.increased PK+ and increased PNa+
e.increased PK+ and decreased PNa+
f.Na influx
g.Na+ efflux
h.K+ influx
i.K+ efflux
-Permeability changes at threshold voltage

Accepted Answer

The answer of Use the answer code below to answer...

Question 17

Indicate the direction that the force in question tends to move the involved ion under the stated conditions by writing the appropriate letter in the blank, using the following answer code:
a.tends to move the involved ion out of the cell
b.tends to move the involved ion into the cell
-Concentration gradient for Na⁺ at threshold potential

Accepted Answer

The answer of Indicate the direction that the force in...

Question 18

One "strong" stimulus can cause more than one action potential, but a "weak" stimulus may or may not generate an action potential.

Accepted Answer

A) True 
 B)False

Question 19

Local current flow

Accepted Answer

A) occurs only on dendrites of neurons 
B) causes impulses to move from the axon hillock toward the neuron's cell body 
C) involves current flowing between active and adjacent inactive areas, thereby bringing the inactive areas to threshold 
D) occurs only on axons of neurons 
E) does not occur on all excitable membranes

Question 20

The neuronal relationship where many presynaptic cells terminate on a single postsynaptic cell is called ____________________.

Accepted Answer

The answer of The neuronal relationship where many presynaptic cells...

Exam 4: Principles of Neural and Hormonal Communication

An unmyelinated fiber with a large diameter can conduct action potentials more rapidly than an unmyelinated fiber with a smaller diameter.

Indicate whether the membrane is more permeable to K⁺ or to Na⁺ or is equally permeable to these ions under the stated conditions: a.more permeable to K+ than to Na+ b.more permeable to Na+ than to K+ c.equally permeable to Na+ and K+ -At resting potential

Schwann cells stimulate the formation of a(n) ____________________ tube to rebuild damaged neurons.

Threshold potential is the peak potential achieved during an action potential.

A balance of IPSPs and EPSPs will negate each other so that the grand postsynaptic potential is essentially unaltered.

All of the following may be considered second messengers except

Use this figure to answer the corresponding questions. -Label "3" is a.a second messenger b.a kinase protein c.a G protein d.a G protein coupled receptor e.an effector enzyme

Match neural disease/influence with correct characteristic. a.multiple sclerosis b.tetanus c.strychnine d.roseola e.Parkinson's disease -Destroys myelin

G proteins in the plasma membrane of certain cells may become activated in response to the binding of water-soluble hormones, whereas protein phosphatases are continuously active in these cells.

Presynaptic inhibition is brought about when dendrites of a postsynaptic neuron alter the signals sent from an axon terminal of a presynaptic neuron.

The negative charge established along the cytosolic border a nerve cell membrane is due to

Preprohormones give rise to lipophilic hormones.

Select the neuropeptide.

An IPSP is

Drugs may influence synaptic transmission by

One "strong" stimulus can cause more than one action potential, but a "weak" stimulus may or may not generate an action potential.

Local current flow

The neuronal relationship where many presynaptic cells terminate on a single postsynaptic cell is called ____________________.