Chapter 4: The Nervous System

Question 1

CNS

Answer 1

Central nervous system; brain and spinal cord; no nerves, integrating centre

Question 2

PNS

Answer 2

Peripheral nervous system; everything else. Carries info to CNS, carries instructions from CNS to effectors

Question 3

Effectors

Answer 3

Muscles and glands

Question 4

Nervous tissue

Answer 4

1. Neurons (nerve cells)

2. Neuorglia aka glia

Question 5

Nerve cells

Answer 5

Aka neurons are the functional unties of the nervous system. Action potentials

Question 6

action potentials

Answer 6

Electrical impulses (signals)

Question 7

Cell body

Answer 7

Soma; part of the neuron that contains organelles (organs in the cell)

Question 8

Nerve fibre

Answer 8

Axon. Fibre means long and thin. An extension of the neuron that carries signals away from its cell body to another neuron or effector

Question 9

Dendrite

Answer 9

Extension of neuron that carries signals towards its cell body from another neuron

Question 10

nerve

Answer 10

A bundle of axons in the PNS

Question 11

Tract

Answer 11

A bundle of nerve fibres in the CNS (not the same as a nerve)

Question 12

Myelin

Answer 12

A white fatty issue that insulates axons

Question 13

Synapse

Answer 13

The site of communication between two neurons

Question 14

neurotransmitter

Answer 14

The chemical molecule that moves form one neuron to the next at synapse; neurons don’t touch. Parkinson’s is a neurodegenerative disease