Chapter 2 The Nervous System

Question 1

What does the nervous system do

Answer 1

It cause a reaction to a stimulus outside the body

Question 2

Name the parts of the nervous system in order

Answer 2

Stimulus,receptor,sensory Neurone, CNS,motor neurone,effector,response

Question 3

What happens when a stimulus is detected eg a cut

Answer 3

The receptors detect this and convert the information to electrical impulses and send it to the brain ( CNS) using the sensory neurones

The CNS then coordinates a response , the impulses from the response are sent along the motor neurone to the effector then the response is triggered to pull the cut away from danger

Question 4

What are neurones

Answer 4

Neurones are nerve cells whihch have extensions to other neurones using dendrites and dendrons to carry these impulses to the cell and

Axons carrying them away from the body into the next cell

Question 5

Why are some axons covered in a myline sheath

Answer 5

To act as an electrical insulator speeding up the electrical impulse

Question 6

What is the structure of the sensory neurone

Answer 6

One long dendrimer carries nerve impulses from receptor cells to the cell body in the middle of the neurone. One short axon carries nerve impulses away from the cell body

Question 7

What is the structure of a motor neurone

Answer 7

Many short dendrites carry never impulese from the CNS to the cell body

One long axon carries nerve impulses from the cell body to the effector cells

Question 8

What is the structure of a really neurone

Answer 8

Many short dendrites carry nerve impulses from the sensory neurones to the cell body

An axon carries nerve impulses from the cell. Body to motor neurones