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Brain Spinal Cord Nerves NeuronsNervous System Brain Spinal Cord Nerves Neurons
Parts of a Neuron Soma – cell body Dendrite – receive messagesAxon – send messages out Myelin – help speed up messages, made up of Schwann cells
Types of Neurons Sensory – incoming signals Motor - movementInterneurons – in brain and spinal cord only (processors/relay terminals)
Neural Connections Synapse – space between axon of neuron A and dendrite of neuron B Neurotransmitter – chemicals that diffuse across synapse to change polarity of neuron B’s dendrite membrane
Central Nervous SystemBrain Spinal Cord Control center, coordinates body functions
Peripheral Nervous SystemCarry messages to and from CNS Motor and sensory neurons found here. No interneurons here!
Brain Cerebrum Thalamus Corpus Callosum Pituitary Gland CerebellumHypothalamus Brain Stem: Pons, Midbrain, Medulla Oblongata Pituitary Gland
Autonomic Nervous SystemInvoluntary Two divisions Sympathetic – fight-or-flight responses Parasympathetic – body at rest
Somatic Nervous SystemCranial and spinal nerves Reflexes – automatic responses to stimuli
Senses Chemoreceptors – chemicals Photoreceptors – lightMechanoreceptors – pressure, vibration
Chemoreceptors Taste – taste buds Sweet Salty Bitter SourOlfaction - smell
Photoreceptors Vision Retina Cones – color Rods – black & white
Mechanoreceptors Hearing – vibration in cochleaBalance – semicircular canals in ears Touch – pressure, pain, heat, cold
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