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Transcript
8th PERIOD SEATING CHART DOOR Front of Room Jason Leslie Fior Davone Melynda Bryant Natalie Karisma Yayemama Ashley Rhaimi Geidsha Lamine Nyomi Jessica Isaiah Jeury Genesis Sean Gabriel Shataysha Diego Latay Randolfa Essence WINDOW DO NOW • Read the front page of today’s activity • What is the difference between a dendrite and an axon? 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. Consists of: brain, spinal cord, nerves and sense organs Sense Organs: Eyes, Skin, Ears, Nose & Tongue Consists of: Brain and Spinal Cord brain Cerebral Cortex Cerebellum Brain Stem Spinal Cord Consists of: Sensory division and Motor division -includes all sensory neurons, motor neurons, and sense organs 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: has nucleus, cytoplasm, & organelles (hand) 2. Dendrites: receives impulses to cell body (fingers) 3. Axon: carries impulses away from cell body (arm) 4. Axon Terminal: where impulses leave the neuron, contains chemical-filled vesicles (neurotransmitters) 1 2 3 4 dendrite Axon cell body cell body TYPICAL MOTOR NEURON synapse muscle tissue Myelin Sheath Sensory Neuron Interneuron Synapse Synapse Motor Neuron Interneuron Synapse Motor Neuron Sensory Neuron Muscle Contracts 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 Motor Neurons carry impulses from the brain & spinal cord to muscles & glands Axon End Axons branching out to muscle fibers
