N. System & Tissue Ch. 11 Pt. 1

Question 1

Axon

Answer 1

Generates/transmits nerve impulses [action potential] away from the cell body

Question 2

Long axon

Answer 2

nerve fibers

Question 3

Occasional branches [axon collaterals]

Answer 3

Numerous terminal branches
Knoblike axon terminals [synaptic knobs]
Secretory region of neuron
Release NT to excite/inhibit other cells

Question 4

Molecules and organelles are..

Answer 4

moved along axons by motor movements in two different directions.

Question 5

Anterograde

Answer 5

toward axon terimnal ; mitochondria, proteins

Question 6

Retrograde

Answer 6

toward cell body ; organelles degraded/recycled

Question 7

Myelin Sheath

Answer 7

Segmented protein-lipoid sheath around most long/large diameter axons

Question 8

Function of the myelin sheath

Answer 8

Protect & electrically insulate axon

Increase speed of nerve impulse

Question 9

Node of ranvier

Answer 9

gaps between Schwann cells in PNS, sites where axon collaterals can emerge.