2 Cells and Communication

Question 1

Neuron vs Neuroglial cells

Answer 1

Neurons: can’t be replaced, function in communication

Neuroglial: can replicate (mitosis), outnumber neurons, play a variety of roles in support, injury, and disease of the NS

Question 2

CNS Neuroglia and function

Answer 2

Astrocytes - Blood Brain Barrier
Oligodendrocytes - Myelinate
Microglia - Macrophage
Ependymal Cells - CSF

Question 3

PNS Neuroglia and function

Answer 3

Schwann Cells - Myelinate
Satellite Cells - PNS ganglia metabolism

Question 4

Can peripheral n regenerate?

Answer 4

Depend on if cell body intact and extent of damage

Question 5

Explain Neurapraxia (Class I)

Answer 5

Mildest, caused by compression

Question 6

Explain Axonotmesis (Class II)

Answer 6

Axon damaged, CT intact

Question 7

Explain Neurotmesis (Class III)

Answer 7

Transection of axon (axon & CT)

Question 8

Graded potential vs Action potential

Answer 8

Graded: Can be summed (spatial/temporal)
Action: Can’t be summed (all-or-none + refractory period)

Question 9

Spatial summation vs Temporal summation

Answer 9

Spatial: Multiple neuron firing (across space)
Temporal: 1 neuron firing multiple potential (over time)

Question 10

How neurons communicate?

Answer 10

Action Potential -> Neurotransmitters released -> bind to receptor