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BIOLOGY
C
HAPTER 2
CONTROL AND COORDI
NATION
THERE ARE TWO
SYSTEMS OF
COORDINATION
IN HUMANS
1 NERVOUS SYSTEM
2 ENDOCRINE SYSTEM (HARMONAL SYSTEM)
HUMAN NERVOUS SYSTEM
THE FUNCTION OF NERVOUS SYSTEM IS TO COORDINATE TH
E ACTIVITIES OF OUR BODY
THE UNIT OF NERVOUS SYSTEM IS CALLED NEURON
A NEURON HAS THREE COMPONENTS
1 CELL BODY
2 DENDRITES
3 AXON
NEURON ARE OF THREE TYPES
1 SENSORY NEURON - TRANSMIT IMPULSE FROM ORGANS T
O THE SPINALCORD AND BRAIN
2 MOTOR NEURONS
- TRANSMIT IMPULSE FROM SPINALC
ORD AND BRAIN TO THE ORGANS
3 RELAY NEURONS
- THEY ARE THE LINKS BETWEEN OTH
ER NEURONS
THE PARTS OF THE NERVOUS SYSTEM
1 CENTRAL NERVOUS SYSTEM
2 PERIPHERAL NERVOUS SYSTEM
(A) VOLUNTRY
(B) INVOLUNTRY
PERIPHERAL NERVOUS
SYSTEM
REFLEX ACTION
THE SIMPLEST FORM OF RESPONSE IN THE NERVOUS SYSTE
M IS CALLED REFLEX ACTION
REFLEX ACTIONS INCLUDE SPINAL CORD IS CALLED SPINA
LREFLEXES
REFLEX ACTIONS INCLUDE BRAIN IS CALLED CEREBRAL
REFLEXES
VOLUNTRY - ACTIVITIES WHICH CAN WE CONTROL
IN VOLUNTRY - ACTIVITIES WHICH CAN WE DO NOT CONTR
OL
CENETRAL NERVOUS SYSTEM
THE CENTRAL NERVOUS SYSTEM IS CONSIST OF THE BRAIN
AND THE SPINAL CORD
HUMAN
BRAIN IS THE HIGHEST
DY
BRAIN
COORDINATING CENTRE IN THE BO
THE BRAIN IS DIVIDED INT
O THREE PARTS
1 FORE BRAIN - IS THE MAIN THINKING PART OF THE B
RAIN
...
2 MID BRAIN
3 HIND BRAIN - DIVIDED INTO THREE CENTERS
(A) PONES
(B) CEREBELLUM
(C) MEDULLA
A PRESENTATION BY
ROHAN
PATYAL
rohanpatyal1@gmail