Nervous system 3 (PNS and Autonomic nervous system)

Question 1

What 2 nervous sytems are motor nerve subdivided into

Answer 1

Somantic and autonomic nervous system

Question 2

What is somantic nervous system

Answer 2

Control voluntary actions:
Conducts impulses from CNS to voluntary muscles
eg running clapping..

Question 3

What is the autonomic nervous system

Answer 3

Controls all invlountary actions
eg blinking, peristalsis, sneezing
(conducts impulses from CNS to smooth muscles and glands..involuntary)

Question 4

List the 2 functions of the PNS

Answer 4

Conduct nerve impulses
1, from receptors to CNS (via sensory neurons)
2. form CNS to effectirs (via motor neurons)

Question 5

What are reflex actions

Answer 5

quick
autonomic response of an effector to the stimulus
Actions that occur independently of the brain (takes place subconsciously)

Question 6

Function of reflex actions

Answer 6

Protective function
Allow body to rapidly respond to harmful stimuli
Protect body from injuries (think burn)

Question 7

Reflexes such as coughing, sneezing and blinking are controlled by … in the brain

Answer 7

Medulla oblongata

Question 8

What are learnt or conditioned reflexes and examples

Answer 8

Reflexes learnt through repetition (obvs. learnt or natural reflexes occur automatically in response to a stimulus, born with it )
eg: cycling, walking, writing, reading

Question 9

What 2 parts of the brain are involved in the process of learning conditioned reflexes until they become automatic

Answer 9

cerebrum and cerebellum

Question 10

NATURAL or unconditioned reflex

Answer 10

(obvs. learnt or natural reflexes occur automatically in response to a stimulus, born with it )

Question 11

What is a reflex arc

Answer 11

A pathway along which impulses are carried from receptor to an effector to bring about a reflex action

Question 12

what is the fucntional unit of the nervous system

Answer 12

a reflex arc

Question 13

2 functions of reflex arc

Answer 13

1. Rapid to provide the hand form further injury’

2. Prevents overload of higher centres of the brain

Question 14

Function of the sympathetic division of the autonomic nervous system

Answer 14

prepares body fro emergency (use of hormone adrenalin)

Flight or fight response

Question 15

Function of parasimpathetic division

Answer 15

Allows body to return to normal after simulation by the sympathetic division (therefore two systems are antagonistic to each other)

Question 16

innervation

Answer 16

TO supply with nerves

Question 17

What is double innervation

Answer 17

Each target organ is served by nerves from both nerve systems