The Nervous System

Question 1

a sitmulus

Answer 1

is any change in your enviroment

Question 2

a receptor

Answer 2

is a nerve cell that detects the stimulus.

Question 3

a neuron

Answer 3

is a specilised cell that carries electrical messages (impulses) around the body

Question 4

an impulse

Answer 4

is an electrical message that is carried along a neuron

Question 5

PNS =

Answer 5

Peripheral nervous system [ nerve and nerve endings].

Question 6

CNS =

Answer 6

central nervous system [ brain and spinal cord ].

Question 7

sensory neuron Aka…

Answer 7

Afferent neuron [ sense organs => brain ]

Question 8

motor neuron Aka…

Answer 8

Efferent neuron [ brain => muscles ]

Question 9

an ____ connects sensory neurons with motor neurons

Answer 9

Interneuron

Question 10

the direction of impulse always goes towards the

Answer 10

neurotransmitter swellings and axon terminals

Question 11

axon carries impulses ____ ____ the cell body..

Answer 11

away from

Question 12

carries impulses to the cell body they also connect to neurons via synapse …..?

Answer 12

Dendrite

Question 13

the refractory period

Answer 13

is the delay between any two impulses. it is a very short period of time during which the neuron fails to react to an impulse because it has just reacted to one. It’s a recovery time.

Question 14

a reflex action

Answer 14

is an automatic, involuntary, unthinking response to a stimulus i.e grasp reflex in babies, blinking, protective actions

Question 15

The Thalmus

Answer 15

is the sorting centre, it directs incoming impulses to the correct centre in the brain.

Question 16

The Hypothalamus

Answer 16

responsible for HOMEOSTASIS

Question 17

whats homeostasis in relation to the hypothalamus

Answer 17

the regulating of the internal environment of a body i.e temperature, water content, PH, appetite. it links with the pituitary gland to control and regulate the production of hormones.

Question 18

axon terminals/neurotransmitter swellings

Answer 18

these mark the end of the particular neuron .they contain neurotransmitter substances in their swellings that are released into the space between one neuron and the next (the synapse) which allows the impulse in one neuron to continue on to the next neuron.

Question 19

the synapse (the synaptic cleft )

Answer 19

is the space at the end of one neuron and the beginning of the next into which chemicals are released that will allow a connection between one neuron and the next.

Question 20

Schwann cells

Answer 20

are located along the length of the neuron and secrete the myelin sheath.

Question 21

myelin sheath

Answer 21

ist an insulating membrane made of fat and keeps the impulse running along the axon and dendrite , prevents it dispersing