Biology

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Biology
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Nervous System
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Human nervous system
Made up of a network of nerve cells or neurones
Two main subsystems in the nervous system
The central nervous system and the peripheral nervous system
The central nervous system
Includes the brain and spinal cord
The peripheral nervous system
Consists of 12 pairs of cranial nerves and 31 pairs of spinal nerves.
Cranial nerve function
Sends impulses from the cranial nerves and to the brain.
Brain
The coordination and control centre for humans
The main components of the brain
Cerebrum, hypothalamus, cerebellum, medulla oblongata and pituitary gland
Cerebrum
The largest and most complex structure present in the frontal part of the brain
Cerebellum
Maintains body balance and coordination of muscle contraction for body movement
Hypothalamus
Coordinating homeostasis and control centre that regulates body temperature, water balance, blood pressure and senses hunger, thirst and fatigue.
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