,Nervous system
.
The human NS is a highly complex & organised network of
Functioning specialised cells .
They enable the brain to receive info about what is happening
-
inside & outside the human body .
everything you sense is controlled by the nervous system
-
.
'
includes voluntary & involuntary res ponces .
voluntary & in v01 .
voluntary involuntary
↳
moving limbs ↳ heart beats
↳ Speaking ↳
blinking
↳
Chewing ↳ natural salivation
NS Functions i. Receive
↳ Information can be received both externally & internally .
↳ external :
through Sensei
↳ internal :
through thoughts .
2 .
Process
↳ Info is sent to the brain for interpretation .
Unique
↳
perception
3 .
Respond
↳ The brain then sends messages to the part of the body that
will desired actions
carry out the .
Divisions of NS single body system multiple subsystems
' -
.
↳ referred to as divisions .
Although division , distinct functions in
-
carry out
, they work the
NS as a co -
ordinated whole .
, Divisions of NS 2 main divisions CNS & PNS
-
-
.
↳ connected by the spinal cord .
CN ) PNS
-
brain spinal cord
receives & processes conducts signals to &
sensory information .
from the brain . Controls
Also initiates responses reflex activities .
& generates thoughts & 1
somatic NS ANS
emotions .
controls voluntary controls involuntary
movement , responses .
I 1
sympathetic parasympathetic
flight or fight rest or digest .
CNS key = • =
Structure
'
brain & spinal cord .
• =
function
-
integrative & control centers .
↑ ↓
PNS
- cranial & spinal nerves
'
communication line between CN ] &
body .
Sensory Division Motor Division
• Somatic & visceral sensory nerve -
motor nerve fibre ]
fibres .
Conducts impulses from receptors . Conducts impulses from CNI to
.
to CNS . effectors .
I ¥
Sympathetic ← Autonomic NS somatic NS
somatic motor
fight
-
flight visceral
- '
or motor
. Conducts impulses
conducts
'
from CNS to muscle ] impulses
from
parasympathetic ← & Hands '
muscles
CNS
.
to skeletal
-
conserves energy .
rest
& digest
•
.
The human NS is a highly complex & organised network of
Functioning specialised cells .
They enable the brain to receive info about what is happening
-
inside & outside the human body .
everything you sense is controlled by the nervous system
-
.
'
includes voluntary & involuntary res ponces .
voluntary & in v01 .
voluntary involuntary
↳
moving limbs ↳ heart beats
↳ Speaking ↳
blinking
↳
Chewing ↳ natural salivation
NS Functions i. Receive
↳ Information can be received both externally & internally .
↳ external :
through Sensei
↳ internal :
through thoughts .
2 .
Process
↳ Info is sent to the brain for interpretation .
Unique
↳
perception
3 .
Respond
↳ The brain then sends messages to the part of the body that
will desired actions
carry out the .
Divisions of NS single body system multiple subsystems
' -
.
↳ referred to as divisions .
Although division , distinct functions in
-
carry out
, they work the
NS as a co -
ordinated whole .
, Divisions of NS 2 main divisions CNS & PNS
-
-
.
↳ connected by the spinal cord .
CN ) PNS
-
brain spinal cord
receives & processes conducts signals to &
sensory information .
from the brain . Controls
Also initiates responses reflex activities .
& generates thoughts & 1
somatic NS ANS
emotions .
controls voluntary controls involuntary
movement , responses .
I 1
sympathetic parasympathetic
flight or fight rest or digest .
CNS key = • =
Structure
'
brain & spinal cord .
• =
function
-
integrative & control centers .
↑ ↓
PNS
- cranial & spinal nerves
'
communication line between CN ] &
body .
Sensory Division Motor Division
• Somatic & visceral sensory nerve -
motor nerve fibre ]
fibres .
Conducts impulses from receptors . Conducts impulses from CNI to
.
to CNS . effectors .
I ¥
Sympathetic ← Autonomic NS somatic NS
somatic motor
fight
-
flight visceral
- '
or motor
. Conducts impulses
conducts
'
from CNS to muscle ] impulses
from
parasympathetic ← & Hands '
muscles
CNS
.
to skeletal
-
conserves energy .
rest
& digest
•
