final paper

III. Neurotransmitters (cont.)

• 3) Norepinephrine:

helps control alertness & arousal

Also implicated in depression

• 4) Acetylcholine

involved in muscle action, learning & memory

lack of acetylcholine associated with Alzheimer’s disease

Black widow spider’s venom floods synapse with acetylcholine

Antagonists inhibit: They may block the neurotransmitter’s release or be similar enough to fit in the receptor cite, but not similar enough to stimulate the receptor.