Nervous + Endocrine System:
Nervous
-
System:
BuN
sensory
-Specialised network of cells and primary communication system
A
I
< 2
parts : Collect + process environmental Stimuli &
/ somatic
Co-ordinate cells and
Autonomic
organs
organs
↳Central
made
Nervous
up of
System:
Brain t Spinal cord
sumpltretia) parasympathetic
-
Brain is the centre of conscious awareness
↳ The cerebral cortex is
highly developed
↳ Divided into 2 hemispheres
Spinal cord is responsible for reflex
-
actions
=
Peripheral Nervous System:
Transmits via from
-
to CNS
messages neurones and
↳ 2 Autonomic : Governs functions
parts: vital
Breathing heart rate etc. . .
-
,
Somatic: Controls muscle movement and receives info from sensory receptors
-Endocrine System:
Glands
=
# Hormones: works
alongsideS to control vital functions through hormones
↳ slower widespread effect
acting but has a more
Glands are that
Organs produce hormones
:
Pituitary gland-master gland-controls release of hormones in all other endocrine
glands
hormones
=
are secreted into bloodstream and affect cells which have the specific receptor
↳ E
g
. :
Thyroid-Thyroxin-D Receptor cells in the heart which affects heart rate
Endocrine ANS :
+
Fight or
Flight:
Often
-
work
together , usually during stressful situations
↳
Stressing Stimulus perceived by hypothalamus activating pituitary gland ~ automatic
Simmedi
ate +
2) This system (no
arouses the sympathetic nervous
longer parasympathetic
Adrenaline gland-D THR
↳ bloodstream
released into by Adrenal , pupil dilation etc.
↳
Parasympathetic takes over once threat is eliminated ,
returning body into
resting state (rest + digest
, Neurones:
100 billion cells 80 % located in the brain
-
+ nerve -
↳ transmit
messages electrically +
chemically
↳ Provide NS with primary source of communication
Types of neurone:
-
3 types of
-
neurones : Sensory neurones
Relay neurones
motor neurones
Structure of a neurone :
heavily in size
-
vary
body (somal genetic material
-
Cell includes nucleus (contains
Dendrites -
branch like structures
protruding from cell body-carry nerve impulses towards cell body
-Axon-Carries impulses away from cell body down the neurone
↳
fatty myelin sheath-protection
↳
Gaps in axon (nodes of ranvier) speed up impulse
Terminal Buttons At the of the accon via
-
-
end and communicate to other neurones synapses
Electrical transmission :
-
when compared cell
in
vesting
a state ,
neurone is negatively charged to the outside
-when activated ,
neurone becomes I've for a split second - causes action potential
-Creates electrical impulse
Nervous
-
System:
BuN
sensory
-Specialised network of cells and primary communication system
A
I
< 2
parts : Collect + process environmental Stimuli &
/ somatic
Co-ordinate cells and
Autonomic
organs
organs
↳Central
made
Nervous
up of
System:
Brain t Spinal cord
sumpltretia) parasympathetic
-
Brain is the centre of conscious awareness
↳ The cerebral cortex is
highly developed
↳ Divided into 2 hemispheres
Spinal cord is responsible for reflex
-
actions
=
Peripheral Nervous System:
Transmits via from
-
to CNS
messages neurones and
↳ 2 Autonomic : Governs functions
parts: vital
Breathing heart rate etc. . .
-
,
Somatic: Controls muscle movement and receives info from sensory receptors
-Endocrine System:
Glands
=
# Hormones: works
alongsideS to control vital functions through hormones
↳ slower widespread effect
acting but has a more
Glands are that
Organs produce hormones
:
Pituitary gland-master gland-controls release of hormones in all other endocrine
glands
hormones
=
are secreted into bloodstream and affect cells which have the specific receptor
↳ E
g
. :
Thyroid-Thyroxin-D Receptor cells in the heart which affects heart rate
Endocrine ANS :
+
Fight or
Flight:
Often
-
work
together , usually during stressful situations
↳
Stressing Stimulus perceived by hypothalamus activating pituitary gland ~ automatic
Simmedi
ate +
2) This system (no
arouses the sympathetic nervous
longer parasympathetic
Adrenaline gland-D THR
↳ bloodstream
released into by Adrenal , pupil dilation etc.
↳
Parasympathetic takes over once threat is eliminated ,
returning body into
resting state (rest + digest
, Neurones:
100 billion cells 80 % located in the brain
-
+ nerve -
↳ transmit
messages electrically +
chemically
↳ Provide NS with primary source of communication
Types of neurone:
-
3 types of
-
neurones : Sensory neurones
Relay neurones
motor neurones
Structure of a neurone :
heavily in size
-
vary
body (somal genetic material
-
Cell includes nucleus (contains
Dendrites -
branch like structures
protruding from cell body-carry nerve impulses towards cell body
-Axon-Carries impulses away from cell body down the neurone
↳
fatty myelin sheath-protection
↳
Gaps in axon (nodes of ranvier) speed up impulse
Terminal Buttons At the of the accon via
-
-
end and communicate to other neurones synapses
Electrical transmission :
-
when compared cell
in
vesting
a state ,
neurone is negatively charged to the outside
-when activated ,
neurone becomes I've for a split second - causes action potential
-Creates electrical impulse
