The Nervous System II: Ion Channels

Topics: Action potential, Neurotransmitter, Neuron Pages: 2 (278 words) Published: January 2, 2014
The Nervous System II: Ion Channels
1.List four neurotransmitters that bind to ion channels, these neurotransmitters
are called __directly____-acting neurotransmitters.
a. ACh
b. glutamate
d. Glycine
2.a. The binding of ACh opens ion channels in the dendrites or cell body that
permits both _sodium______ and _potassium____ to move through them. b. Which ion would move into the cell? _sodium____out of the cell? _potassium_____________
c. Which ion has the greatest electrochemical gradient? _sodium______ d. The net movement of these two ions would do what to the cell? _depolarize__
e. This would be called an ____excitatory________
postsynaptic potential, or __epsp__________________.
3.a. An inhibitory postsynaptic potential (IPSP) causes a neuron to __hyperpolarize_________________.
b. An example of a neurotransmitter that causes an IPSP is ___gaba___________. c. What type of ions move into the cell in response to this neurotransmitter? __C1-____________.
4.a. Norepinephrine binds to a receptor that is separate from the ion channel.
This is known as a/an _____indirectly__ - acting neurotransmitter. b. Norepinephrine is known as the ____first_________ messenger. c. The receptor is coupled to the ion channel by a ___G protein________________. 5.a. This activates an enzyme which induces the production of a ___second__________ messenger.

b. An intracellular enzyme is activated and ___phosphorylate_________________ the ion channel. c. As a result of this sequence of events, what channels are closed? __K+__________________
d. What does this do to the neuron? __depolarizes______
6.Name three neurotransmitters that can only act indirectly. a. noreepinephrine
b. epinephrine
c. dopamine
7.Which of the four neurotransmitters mentioned in question 1 can also act indirectly? a. ACh
b. glutamate
8.Which one of the four neurotransmitters mentioned in question 1 can
only act directly? ____glycine__________________...
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