Main Function: This communication system controls and coordinates functions throughout the body and responds to internal and external stimuli. Our nervous.

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Presentation transcript:

Main Function: This communication system controls and coordinates functions throughout the body and responds to internal and external stimuli. Our nervous system allows us to feel pain.

brain Spinal Cord Cerebellum Cerebrum Medulla Oblongata Consists of: Brain and Spinal Cord

CerebrumVoluntary or conscious activities of the body-learning, judgment CerebellumCoordinates and balances the actions of the muscles Medulla Oblongata (Brain Stem) Controls involuntary actions like blood pressure, heart rate, breathing, and swallowing Spinal Cord The main communications link between the brain and the rest of the body

Consists of: Sensory division and Motor division -includes all sensory neurons, motor neurons, and sense organs

Consists of: brain, spinal cord, nerves and sense organs Sense Organs: Eyes, Skin, Ears, Nose & Tongue

A nerve is an organ containing a bundle of nerve cells called neurons. Neurons carry electrical messages called impulses throughout the body. Picture shows hundreds of severed neuron axons

Parts of a Neuron 1.Cell body: contains nucleus & most of the cytoplasm 2.Dendrites: projections that bring impulses into the neuron to the cell body. 3.Axon: long projection that carries impulses away from cell body 1 3 2

cell body muscle tissue TYPICAL MOTOR NEURON Axon dendrite synapse cell body

Because neurons never touch, chemical signalers called neurotransmitters must travel through the space called synapse between two neurons. Neurotransmitters Synapse (gap) The message is transferred when RECEPTORS receive neurotrans- mitters. (pink spheres)

Sensory Neuron Interneuron Motor Neuron Sensory Neuron Interneuron Motor Neuron Muscle Contracts Synapse

Sensory Neuron carry impulses from sense organs to spinal cord & brain Fun Fact: Where can the largest cells in the world be found? The giraffe’s sensory and motor neurons! Some must bring impulses from the bottom of their legs to their spinal cord several meters away!!

Interneuron -processes impulses in brain and spinal cord - connect sensory and motor neurons

Nerves work together with muscles for movement. An impulse begins when one neuron is stimulated by another neuron or by the sense organs. The impulse travels down the axons of Sensory neurons to the brain cells called Interneurons. The brain will then send an impulse through motor neurons to the necessary muscle or organs, telling it to contract.

Motor Motor Neurons carry impulses from the brain & spinal cord to muscles & glands Axon End Axons branching out to muscle fibers

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