31 Nervous System

Question 1

Parasympathetic division primes body for

Answer 1

Rest! Digestion, conserving energy.

Question 2

Sympathetic division primes body for

Answer 2

Intense energy-consuming activities

Question 3

Divisions of ANS (autonomic nervous system)

Answer 3

Sympathetic, parasympathetic, enteric

Question 4

Myelinated sheath is made up of

Answer 4

SCHWAAAANN CELLLS

Question 5

Voltage-gated ion channels are densely concentrated at

Answer 5

Nodes of ranvierrr bish

Question 6

Define action potential

Answer 6

electrical signal used for communication. A change in membrane voltage in response to stimulus that is transmitted along axon to synaptic terminal.

Question 7

Pros of chemical synapses

Answer 7

• synapse can be strengthened or weakened due to changes on either presynaptic or postsynaptic terminal
• ie., they are plastic. Important for learning and memory.

Question 8

Pro of electrical signals

Answer 8

Good for very fast instantaneous information transfer, and synchrony of large neuron populations.

Question 9

Why are synapses so important?

Answer 9

• can strengthen and weaken, allowing neural plasticity
• site of drug action
• many developmental degenerative disorders (Alzheimer’s) are diseases of the synapse

Question 10

Homeostatic control centre. Controls pituitary gland, like a biological clock

Answer 10

Hypothalamus

Question 11

Sorts data, both input and output, of cerebrum. “Relay centre”

Answer 11

Thalamus

Question 12

Are gap junctions hydrophilic or phobic

Answer 12

Hydrophilic

Question 13

These 4 things can be passed through gap junctions

Answer 13

Ions
Sugars
Amino acids
Nucleotides!