Question

7). Contrast the actions of acetylcholine (ACh), GABA and norepinephrine at their respective synapses.

8). Compare and contrast the composition and locations of gray and white matter in the spinal cord vs. the brain.

9). How does the function of the semicircular ducts differ from the function of the saccule and utricle?

10). Distinguish between acetylcholine, an acetylcholine receptor, and acetylcholinesterase. State where each is found and describe the function it serves.

Answer 1

7) Action of the neuotransmitter at their respective synapse

ACh	GABA	NE
Excitatory	Inhibitory	Excitatory

8)

	Brain	spinal cord
Grey matter (cell bodies)	Outer cortex	Inner
White matter (axons)	Inner	Outer

9) Semicircular ducts - responds to angular accilearation

Saccule and utricle - responds to linear accileration

10) acetylcholine - It is a excitatory neurotransmitter, present in the axonal terminal inside the vesicle. They are released in response to calcium influx into the synaptic cleft and attches its receptor.

Acetylcholine receptor - These are located in the post synaptic membrane, and are responsbile for the generation of post synaptic membrane potential.

Acetylcholinesterase - It is the enzyme present in the synaptic cleft and also in plasma, responsible for the degradation of Acetylcholine and hence terminate its action.