The Nervous System The Nervous System Principles of Health Science
The Nervous SystemThe Nervous SystemPrinciples of Health
Science
What is the nervous system What is the nervous system composed of?composed of?
• Brain• Spinal Cord• Nerves• Sense Organs• Receptors
Fun Fun factsfacts first! first!
What’s it made of?What’s it made of?
• 77% Water• 10-12% Lipids• 8% Protein• 1% Carbs• 2% Soluble Organics• 1% Inorganic Salt
There are…There are…
• 100 Billion Neurons in the Human Brain
About The same amount…About The same amount…
• Of Stars in the Sky
The left hemisphere has…The left hemisphere has…
• 186 million more neurons than the right hemisphere.
750-1000ml of blood flow…750-1000ml of blood flow…
• through the brain every minute.• This is about 3 full soda cans!
The brain can stay alive…The brain can stay alive…
• 4-6 minutes without oxygen!
The slowest neurons in the brain…The slowest neurons in the brain…
• travel at 260 MPH. • As “slow” as today’s fastest car!
(Clocked at 253 MPH)
More electrical impulses…More electrical impulses…
• Are generated in one day by a single human brain than all the telephones in the world.
The human brain has…The human brain has…
• 70,000 thoughts in an average day.
FUNCTIONS OF FUNCTIONS OF THE BRAINTHE BRAIN
(or noodle)
• Creativity
• Imagination
• Artists• Dreamer
s• Visual
Spatial
• Logical• Mathematic
al
• Linguistic• Speech
LeftLeft vs.vs. rightright
How does the How does the
brain
communicate communicate with the rest of with the rest of
the body?the body?
neuronsneurons
Sensory NeuronsSensory Neurons
• Specialized to detect senses• Example: pressure or heat
Motor neuronsMotor neurons
• Impulses that signal muscle contractions… motion.
interneuronsinterneurons
• Connect with other neurons.
CFUCFUPlease put your notes away and your
thinking cap on.
Rules:Rules:• Use your motor neurons (raise your hand) if you
think you know the answer!• If you get it right then I will feed your sensory
organs.
Part of the nervous system that starts with a “B”Part of the nervous system that starts with a “B”
#1
Name that neuron:Name that neuron:
(The connection of neurons)
#2
Two Parts of the nervous system that start with Two Parts of the nervous system that start with an “s”an “s”
#3
Name that Neuron:Name that Neuron:
(Senses heat)#4
Part of the nervous system that starts with an Part of the nervous system that starts with an “N”“N”
#5
Part of the nervous system that starts with an Part of the nervous system that starts with an “R”“R”
#6
Name that Neuron:Name that Neuron:
#7
Name that Neuron:Name that Neuron:
#8