Topic 3

Question 1

What is neuron cells have?

Answer 1

Dendrites, cell bodies, axons, axon-terminals, (sometimes) myelin sheath

Question 2

What does the axon do?

Answer 2

-extension of cytoplasm
-impulses travel down it
-transmit info to effector organ or neuron

Question 3

What is myelin?

Answer 3

White fatty materials, acts as insulator
In PNS formed by Schwann cells
In CNS formed by **

Question 4

Grey Vs. White matter

Answer 4

Grey matter: non-myelinated areas
White matter: myelinated areas

Question 5

Def: Ganglia

Answer 5

Cluster of neuron cells

Question 6

3 types of neurons and functions

Answer 6

-Sensory(afferent in CNS AND PNS): Relays info received by sensory receptors to CNS
-Interneurons(association in CNS): link between both.
-Motor(efferent in CNS AND PNS): Nervous system to effector (produces physiological response like muscle contraction)

Question 7

Reflex arc

Answer 7

Stimulus—>sensory neuron—>interneurons—>motor neurons—>effector

All happens in spinal cord except first and last!