9.4 Mammalian Nervous System

Question 1

Difference in structure in myelinated sensory and myelinated motor neurone

Answer 1

Sensory:
Dendron is longer
Dendron is myelinated
Axon is shorter
Motor:
Has a motor end plate

Question 2

Which substances bind to acetylcholine receptors

Answer 2

Cobra venom
Nicotine

Question 3

What does lidocaine bind to

Answer 3

Voltage gated Na+ channels

Question 4

Describe the events that lead to release of acetylcholine at a synapse

Answer 4

Action potential arrives at presynaptic knob
Ca2+ channels open and Ca2+ diffuses in
Vesicles move to membrane
Vehicles fuse with membrane and release acetylcholine

Question 5

How does acetylcholine cause an excitory post synaptic potential once released into cleft

Answer 5

Bonds to receptors on post synaptic membrane causing sodium channels to open

Question 6

Is nicotine excitatory or inhibitory

Answer 6

Excitory

Question 7

Is lidocaine excitory or inhibitory

Answer 7

Inhibitory

Question 8

Is cobra venom excitory or inhibitory

Answer 8

Inhibitory