Nervous System

Question 1

Astrocytes

Answer 1

Maintain blood brain barrier, provide structural support, regulate ion, nutrient, and dissolved gas concentrations, absorb and recycle NT’s.

Question 2

Ependymal Cells

Answer 2

Line ventricles (brain) and central canal (spinal cord); assist in producing, circulating, and monitoring cerebrospinal fluid. Move the fluid in those spaces.

Question 3

Oligodendrocytes

Answer 3

myelinated CNS axons

Question 4

Microglia

Answer 4

remove cell debris, wastes, and pathogens by phagocytosis

Question 5

What kind of cell tissue does ependymal cells fall under?

Answer 5

simple cuboidal epithelium

Question 6

Neurolemma

Answer 6

outer surface of Schwann cells.

Question 7

The major difference between oligo and Schwann cells

Answer 7

Schwann cells myelinated one axon in a particular area while oligo cells myelinated multiple axons.

Question 8

Steps to Neuronal Repair

Answer 8

1. Fragmentation of axon and myelin occurs in distal stump.
2. Schwann cells form cord, grow into cut, and unite stumps. Macrophages engulf degenerating axon and myelin.
3. Axon sends buds into network of Schwann cells and then starts growing along cord of Schwann cells.
4. Axon continues to grow into distal stump and is enclosed by Schwann cells.

Question 9

Generation is at a ___

Answer 9

Single spot

Question 10

Continuous propagation:

Answer 10

Generation of AP’s at each node with a refractory period following each generation at the previous nodes. This is in unmyelinated axons.

Question 11

Saltatory propagation:

Answer 11

In myelinated axons. Myelin allows the local current to flow farther down as myelin blocks Sodium leak channels. Signals spread farther without making another action potential.