Nervous System

Question 1

Neurons (Functions)

Answer 1

Collect information about the internal and external environment

Process and integrate information

Act on the information received

Question 2

Parts of Neuron

Answer 2

Dendrites*
Cell body*
Nucleus
Cell membrane
Axons*
Axon hillock
Myelin sheath*
Nod of Ranvier
Schwann cell
Axon Terminal
most common features

Be able to draw diagram and give functions

Question 3

Myelinated neurons

Answer 3

Neurons with myelinated sheaths
‘White matter found in peripheral nervous system

Question 4

Unmyelinated neurons

Answer 4

Neurons lacking myelin sheaths
‘Grey matter’ found in the brain and spinal cord

Question 5

nodes of Ranvier

Answer 5

Gaps in the myelin sheath speeding up conduction of neural (electrical) impulses by allowing the impulse to ‘jump’ from one node to the next - Saltatory conduction

Question 6

Sensory Neuron (Receptor Neurons) Function

Answer 6

Carry messages from the receptors in the sense organs, or in the skin, to the brain and spinal cord (CNS)
Impulses toward CNS

Question 7

Motor Neurons (Effector Neurons) Function

Answer 7

Carry messages from the brain and spinal cord (CNS) to the muscles and glands (the effectors)
Impulses away from CNS

Question 8

Relay Neurons (Inter Neurons, Connector Neurons, Association Neurons) function

Answer 8

Link the sensory and motor neurons in the CNS
Within CNS

Question 9

Nervous System

Answer 9

Communication network and control centre of the body

Question 10

Nerve fibre

Answer 10

Any long extension of cytoplasm of a nerve cell body (usually refers to axons & dendrites of nerve cells)