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31 Aug 2018

Which of the following statements is TRUE?

a. Adrenergic nerve endings release norepinephrine
b. All of the options are TRUE
c. The central nervous sytem is made up of the brain and spinal cord
d. Both sympathetic and parasympathetic pre-ganglionic neurons release acetylcholine to cholinergic receptors.
e. During neural secretion, calcium binds to vesicles and causes the vesicles to release neurotransmitters into the synapse

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Nestor Rutherford
Nestor RutherfordLv2
2 Sep 2018
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Tetraethylammonium (TEA) is a drug that blocks voltage-gated potassium channels. What effect would this have on an action potential?

(a)Prevent the rising phase

(b)Prevent the cell from reaching the threshold to trigger an action potential

(c)Prevent or prolong the falling phase

(d)None of the above

The hyperpolarization phase of the action potential is due to:

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(b)Prolonged opening of voltage gated K+ channels

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(d)Rapid inactivation of voltage-gated K+ channels

The period when it is difficult to initiate another action potential for several milliseconds due to voltage-gated sodium channel inactivation is referred to as the:

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(b)Absolute refractory period

(c)Resting period

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In the human central nervous system, Gap junctions are found:

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(d)In all cells

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(c)The neurotransmitter receptor

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Benzodiazepines such as Valium allosterically regulate GABA receptors by:

(a)Binding at receptor sites other than the transmitter binding site

(b)Binding at the transmitter (GABA) binding site on the receptor

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GABA-A receptors are ligand-gated Cl- channels. The equilibrium potential of Cl- is -65 mV. At the neuronal resting membrane potential of -65 mV, GABA binding to the GABA-A receptor would result in the opening the Cl- channel, resulting in:

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(d)Cl- outflow and hyperpolarization

At the mammalian neuromuscular junction, the released neurotransmitter acts on:

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(b)presynaptic membrane transporters

(c)vesicular transporters

(d)all of the above

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(c)Leak channels

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NMDA receptors are unique in that their ion channel is:

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