Definitions

Question 1

Dendrite

Answer 1

The component of a Neuron that receives information and sends it to the cell body

Question 2

Nucleus

Answer 2

A group of cell bodies

Question 3

Tract

Answer 3

A bundle of axons

Question 4

Grey matter

Answer 4

A group of cell bodies in the CNS

Question 5

White matter

Answer 5

A bundle of axons in the CNS

Question 6

Ganglion

Answer 6

A group of Cell bodies in the PNS

Question 7

Nerve

Answer 7

Bundle of axons in the PNS

Question 8

Astrocyte

Answer 8

A Glia in the CNS that supplies nutrients to neurons, Ensheaths blood capillaries, and transmit information

Question 9

Microglia

Answer 9

Immune cells of the CNS that engulf microorganisms and debris

Question 10

Ependymal Cell

Answer 10

A Glia cell of the CNS that lines fluid-filled spaces of the brain and spinal cord such as the ventricular system. They have Cilia to circulate CSF

Question 11

Oligodendrocytes

Answer 11

Support nerve fibres in the CNS by ensheathing them with myelin

Question 12

Schwann cells

Answer 12

Support nerve fibres in the PNS by ensheathing them with myelin

Question 13

Node of Ranvier

Answer 13

The gaps between myelin on a neuron axons to increase conduction

Question 14

Afferent

Answer 14

Information that goes INTO the brain

Question 15

Efferent

Answer 15

Response that comes OUT OF the brain

Question 16

Somatic

Answer 16

The stuff we are aware of and have control over

Question 17

Autonomic

Answer 17

The stuff that we are not aware of nor have control over

Question 18

Sympathetic

Answer 18

Prepares the body for stress responses “Fight or flight” system

Question 19

Parasympathetic

Answer 19

Prepares the body for restful situations “Rest and Digest” system

Question 20

Depolarisation

Answer 20

When the resting membrane potential inside the cell goes above -70mV (becomes more positive)

Question 21

Repolarisation

Answer 21

When the resting membrane potential of inside the cell becomes more negative and returns to -70mV

Question 22

Absolute refractory period

Answer 22

Nothing else can happen across the membrane (no more synaptic transmissions) Only one action potential can occur at once

Question 23

Relative refractory period

Answer 23

The membrane potential is a little more relaxed and so there is a higher chance that another action potential can occur