The document outlines the importance of the nervous system in maintaining homeostasis and processing sensory information. It describes the roles of different types of neurons, including efferent and afferent neurons, and highlights key features of the human brain, such as its weight, water content, oxygen consumption, and its structural components. Overall, the nervous system is portrayed as a complex network essential for bodily functions and environmental interaction.

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2. The Nervous System
• The nervous system is very important in helping to
maintain the homeostasis (balance) of the human
body.
• A series of sensory receptors work with the
nervous system to provide information about
changes in both the internal and external
environments.
• Human nervous system is a complex of
interconnected systems in which larger systems
are comprised of smaller subsystems each of
which have specific structures with specific
functions
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4. NEURONS (nerve cells) are
the basic elements of the
nervous system
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5. Types of Neurons
Neuron A NEURON B
neurotransmitter Synapse
Efferent (motor)
Conveys
information
from the CNS
to muscle and
glands.
Afferent (sensory)
Carry
information
from sensory
receptors to the
CNS
Interneuron
Carry and
process
sensory
information
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6. Brain
• Weights about 3 pounds in adults.
• 75% water
• 20% of oxygen
• Contains over 100 billion neurons
• Controls bodily functions & interactions with the
outside world
Brain Parts
1. Cerebrum
2. Diencephalons
3. Brain stem
4. Cerebellum
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