Nervous System

Question 1

Nervous tissue

Answer 1

The main compound of the nervous system
-It creates nerve impulses that travel from one body part to another in milliseconds
-nervous issues contains two cells known as neurones and glial cells

Question 2

Glial cells

Answer 2

-Provide protection and support to nervous tissue
-in direct contact with neurones and often surround them
-many types such as; Astrocytes, oligodendrocyte, Schwann cells and satellite cells

Question 3

Neurones

Answer 3

-specialised cells that conduct electrical impulses

Question 4

Myelin sheath

Answer 4

-acts as an insulator that surrounds most sensory and motor neurons
-speeds up conduction of action potential
-protects the neurons from damage
-interneurons are mainly unmyelinated, this is to help them be more sensitive to change

Question 5

Motor neurons

Answer 5

-nerve cells that are responsible for carrying signals away from the CNS towards muscles to cause movement
-release neurotransmitters to trigger responses leading to muscle movement
-located in the brain stem or spinal cord and connect to muscles, glands and organs

Question 6

Interneuron (relay neuron)

Answer 6

-allows sensory and motor neurones to communicate with each other
-connect various neurons within the brain and spinal cord, short axons
-they are multipolar, they have one axon and several dendrites

Question 7

Sensory neurons

Answer 7

-carry nerve impulses from sensory receptors towards the CNS and brain
-when these nerve impulses reach the brain they are translated into ‘sensations’ eg vision,hearing, touch and taste.
-pseudounipolar (they have one axon, split into two branches)