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The Nervous System
Agriculture Biology
What is the nervous system
composed of?
• Brain
• Spinal Cord
• Nerves
• Sense Organs
• Receptors
Fun facts first!
What’s it made of?
• 77% Water
• 10-12% Lipids
• 8% Protein
• 1% Carbs
• 2% Soluble Organics
• 1% Inorganic Salt
There are…
• 100 Billion Neurons in the Human Brain
About The same amount…
• Of Stars in the Sky
The left hemisphere has…
• 186 million more
neurons than the
right hemisphere.
750-1000ml of blood flow…
• through the brain every minute.
• This is about 3 full soda cans!
The brain can stay alive…
• 4-6 minutes
without
oxygen!
The slowest neurons in the brain…
• travel at 260 MPH.
• As “slow” as today’s fastest car!
(Clocked at 253 MPH)
More electrical impulses…
• Are generated in
one day by a
single human
brain than all the
telephones in the
world.
The human brain has…
• 70,000 thoughts
in an average
day.
FUNCTIONS OF
THE BRAIN
(or noodle)
Left
vs.
right
• Logical
• Creativity
• Mathematical
• Imagination
• Linguistic
• Speech
• Artists
• Dreamers
• Visual
Spatial
How does the
brain
communicate
with the rest
of the body?
neurons
Sensory Neurons
• Specialized to detect senses
• Example: pressure or heat
Motor neurons
• Impulses that
signal muscle
contractions…
motion.
interneurons
• Connect with
other neurons.