nervous system

Question 1

what are the functions of the nervous system

Answer 1

relays information around the body ensuring systems maintain homeostasis

generates reactions by sending info through network of nerves

controls, regulates and communicates info within the body

Question 2

what are the 2 types of nervous system

Answer 2

central nervous system
peripheral nervous system

Question 3

what does the CNS contain

Answer 3

Brian and spinal cord

Question 4

what neuron’s are in the CNS

Answer 4

inter/ relay neurons

Question 5

what does the PNS contain

Answer 5

motor and sensory neurons

Question 6

function of PNS

Answer 6

relays info throughout the body

Question 7

function of the CNS

Answer 7

receives sensory information, analyses it, formulates a response and sends info through motor neutrons to the effectors

Question 8

what are the three types of neurons

Answer 8

relay
sensory
motor

Question 9

what is the function of sensory neurons

Answer 9

transmits info from a receptor to the CNS
transmits info into the CNS via affrentt neurons

Question 10

what is the function of relay neurons

Answer 10

situated in the spinal cord and transmits info within the CNS.

Question 11

what Is the function of the motor neuron

Answer 11

transmits info from the CNS to an effector
conducts info from the brain and spinal cord to the effector
provides instruction to the body parts on how react to a stimulus

Question 12

function of cell body in neuron structure

Answer 12

contains the nucleus

Question 13

function of myelin sheath

Answer 13

insulates a neuron increasing speed of the nerve impulse

Question 14

function of Schwann cell

Answer 14

provides the myelin sheath

Question 15

function of node of ranvier

Answer 15

gaps within the myelin sheath

Question 16

function of axon

Answer 16

transmits nerve impulses away from the cell body

Question 17

function of dendrite

Answer 17

receives incoming impulses for the neurone

Question 18

function of synaptic vesicle

Answer 18

contains neuro-transmitters

Question 19

function of synaptic end bulb

Answer 19

ballon like structure at the distal portion of an axon

Question 20

how many pairs of spinal nerves are there

Answer 20

31

Question 21

where are the sodium and potassium channels located

Answer 21

nodes of ranvier

Question 22

what happens when the neuron is polarised

Answer 22

not sending a signal, resting
outside membrane excess sodium
inside membrane excess of potassium

Question 23

what happens when the neuron is depolarised

Answer 23

neuron receives a nerve impulse
sodium rushed inside of membrane becoming more positive ie depolarised

Question 24

what needs to be met so the action potential is achieved

Answer 24

threshold

Question 25

what occurs in repolarisation

Answer 25

sodium gates begin to close
potassium gates open to allow potassium to flow out of cell
electrical charges begins to be restored to resting value

Question 26

what is the electrical charges resting value

Answer 26

-70mV

Question 27

how long does depolarising and repolarising approx take

Answer 27

about 1 millisecond

Question 28

how many pairs of nerves are connected to the brain

Answer 28

12

Question 29

function of cranial nerves

Answer 29

transmit info fro sensory organs
control muscles/glands

Question 30

approximately how many neurons and neurogila do we have in the brain

Answer 30

100 billion neurons
1 trillion neuroglia

Question 31

what percentage of the bodies o2 does neurons and neurogilia require

Answer 31

20% with it being 2% of the body’s weight