Neurophysiology and

Question 1

Biogenic amines can function as?

Answer 1

• Hormones
• Neuromodulators

Question 2

Which system is the most common target for poisoning?

Answer 2

Central Nervous System

Question 3

What does a neuron need to maintain resting membrane potential?

Answer 3

Low internal sodium, high internal potassium, and osmoregulatory capability

Question 4

What are some important differences between insect and mammalian nervous systems?

Answer 4

• Insects have different distributions of muscarinic and nicotinic acetylcholine receptors
• Insects do not have distinct myelination in their nervous system
• The insect neuromuscular junction has no distinct “end plates”

Question 5

What is the purpose of acetylcholinesterase?

Answer 5

It breaks down acetylcholine to prevent indefinite stimulation

Question 6

Graded potentials…

Answer 6

• develop slowly
• are proportional in strength to the stimulus

Question 7

What causes hyperpolarization of the axon membrane?

Answer 7

Voltage-gated potassium channels are slow to close, causing extra K+ to flow outside of the cell

Question 8

What is the typical order of events in the action potential?

Answer 8

Stimulus-> depolarization-> repolarization-> refractory period-> resting state