The Nervous SystemThe Nervous SystemBy: Marlayna By: Marlayna Botello, Taylor Botello, Taylor Gersbach, John Gersbach, John Salvesen, Ryan Salvesen, Ryan

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The Nervous SystemThe Nervous System

►The Nervous The Nervous system an organ system an organ system containing system containing a network of a network of neurons that send neurons that send emotion reactions emotion reactions and functions from and functions from the body to the the body to the brain.brain.

Major facts about the Nervous Major facts about the Nervous SystemSystem

► Senses from inside Senses from inside the body to the brain the body to the brain and back again.and back again.

► Electric signals Electric signals through the spinal through the spinal cord. cord.

► Sends messages Sends messages from senses (nerves) from senses (nerves) to brain to process to brain to process through neurons.through neurons.

Major parts of the Nervous Major parts of the Nervous systemsystem

The Brain: process signals / feelings outside and inside the body , and sends out signals for reactions/ movement.

Nerves is like a highway along the spinal cord. Spinal Cords: are like a signal highway

Neurons send signals from touch to react.

Nerve impulseNerve impulse

From the sight of the stimuli, the nerve From the sight of the stimuli, the nerve travels trough the body and up the travels trough the body and up the spinal cord towards the brain, which spinal cord towards the brain, which then transmits and processes then transmits and processes information.information.

How the body system worksHow the body system works

►Nervous system is the Nervous system is the function of function of everything.everything.

► It sends signals It sends signals notify the brain to notify the brain to react to the situation.react to the situation.

►Reflexes, movement, Reflexes, movement, muscles, everything!muscles, everything!

4 Facts about the Nervous 4 Facts about the Nervous systemsystem

► The average adult The average adult human brain weighs 1.3 human brain weighs 1.3 to 1.4 kg to 1.4 kg (Approximately 3 (Approximately 3 Lbs)!!!Lbs)!!!

►A stegosaurus dinosaur A stegosaurus dinosaur weighed approximately weighed approximately 1600kg but bad a brain 1600kg but bad a brain that only weighed 70g that only weighed 70g (.07 kg)(.07 kg)

More FactsMore Facts

►The fastest The fastest brain reaction brain reaction recorded was recorded was 100 m/s.100 m/s.

►A child in the A child in the womb develops womb develops neurons at a neurons at a rate of 250,000 rate of 250,000 neurons per neurons per minute.minute.

SynapsesSynapses► Electrical SynapsesElectrical Synapses► Direct electrical Direct electrical

connectionsconnections► Faster than chemical Faster than chemical

reactions.reactions.► Happens between Happens between

neuronsneurons► Chemical synapsesChemical synapses► Common and have a Common and have a

circuit circuit ► Happens between Happens between

neuron cells and other neuron cells and other cells throughout the cells throughout the body.body.