Divisions of the nervous system

Question 1

what does the nervous system divide into?

Answer 1

NS
| |
CNS PNS
| |
ANS SNS
| |
SNS PNS

Question 2

What is the HNS?

Answer 2

a complex network of nerve cells
that carry messages to and from the brain and the spinal chord to different parts of the body

Question 3

What is the CNS?
(4)

Answer 3

-comprises the brain and spinal cord. -brain is divided into separate areas, each has a different function; rang ing from controlling thought and speech to controlling skills and balance.
-function of the spinal cord is to relay information between the brain and the rest of the body.
-only relay neurons

Question 4

What is the PNS?

Answer 4

-comprises the nerves outside the CNS (sensory and motor).
-It relays nerve impulses between the CNS and the rest of the body. (connects cns to organs, limbs and skin

Question 5

What are the 2 divisions of the pns?

Answer 5

-autonomic nervous system
-somatic nervous systems

Question 6

What does the ans do?

Answer 6

controls involuntary actions that we have no conscious control over (breathing and heartbeat).
-connects to internal organs and glands

Question 7

what are the 2 divisions of the ANS?

Answer 7

-sympathetic nervous system, which has an arousing effect on the body, such as preparing the body for ‘Fight or Flight’; -the parasympathetic nervous system, which has a calming effect and helps the body return to homeostasis after a period of excitation

Question 8

what is an example of the pns calming effect?

Answer 8

rest and digest response

Question 9

what is the somatic nervous system?

Answer 9

-consists of sensory neurons which send info from the sense organs to the cns.
-also consists of motor neurons which send info from the cns to voluntarily control skeletal muscles.