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Biology B3
The Nervous System
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Nervous Co-ordination
Biology B3 > The Nervous System
8 cards
Cards (24)
Nervous system
Made up of
neurons
(
nerve cells
), which go to all parts of the
body
Sensory receptors
Detect different stimuli
, e.g. light, sound, touch, temperature
Sense organs
are what detect
stimuli
from the
environment
e.g.
nose
,
tongue
,
ears
Receptors
in the
sense organs
are connected to the
CNS
, which is made up of the
brain
and
spinal chord
The
brain
and
spinal chord
make sense of information sent by the
nerves
and
co-ordinate
a
reaction
The
skin
is a
sense organ
and its
receptor cells
are
pressure
and
temperature
, the stimulus being
pressure
and
heat
The
tongues receptor cell
is
taste
and the
stimulus
is from a
chemical
The
nose receptor cells
are
smell
and
taste
and their stimulus are
chemicals
Neurone
-
1
nerve cell
Nerve
- A
bundle
of
nerve cells
Nerve cell diagram
A)
dendrite
B)
nucleus
C)
axon
D)
cytoplasm
E)
cell membrane
F)
nerve ending
6
Nerve cells have
branched dendrites
to pick up
impulses
and
transmit
them from one
nerve
into the other
The
fatty sheath
insulates the axon of the nerve cell to contain
electrical impulses
to
protect
them and allow
faster transmission
Relay neurons
connect the
sensory
and
motor neuron
at the
CNS
Sensory receptors
send
impulses
to the
CNS
Motor neurons
send the impulse to the
muscle
for them to
relax
or
contract
based on the
decision
of the
CNS
3 main stages of a nervous response
Stimulus
-
Change
in
environment
e.g.
pressure
on
skin
Stimulus detection
-
Sensory receptors
detect
stimulus
and
transmit impulse
along the
axon
Response
from
effectors
-
Response signal
transmitted along axon of
motor neuron
to
motor end plate
, then
effectors
e.g.
muscles
,
glands
Each nerve cell
A)
sensory neuron
B)
relay neuron
C)
motor neuton
3
Synapase
is the place where
impulses
are
transmitted
between
two nerve cells
, or between
gland
or
muscle cells
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