Ch.12 notes BIOL 240
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This 2 page Class Notes was uploaded by Erica Notetaker on Monday April 18, 2016. The Class Notes belongs to BIOL 240 at Southern Illinois University Edwardsville taught by Ashley Jabs in Spring 2016. Since its upload, it has received 28 views. For similar materials see Human Anatomy & Physiology I in Biology at Southern Illinois University Edwardsville.
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Date Created: 04/18/16
Ch.12 Nervous System Functions: recognize and respond to change with help of action potential 3 Steps: (always in this order) 1. Sensory: recognize change 2. Interpretation 3. Motor: respond to change 2 Divisions 1. CNS (central nervous system) brain and spinal cord most signals that starts muscle contraction and gland secretions 2. PNS (peripheral nervous system) everything besides brain and spinal cord 3 parts Somatic: voluntary control Sensory= afferent =from head and limbs towards CNS Interneurons= middle Motor = efferent = from CNS to skeletal muscles Autonomic: involuntary control Sensory = afferent = from internal towards CNS Interneurons = middle Motor = efferent = from CNS to cardiac and smooth muscles Enteric: involuntary control GI tract Digestion Neurons = communicators Receive, process, transmits info Control flow across membranes Parts of neuron 1. Dendrites Receive info from other neuron Move impulse towards cell body Move info down axon 2. Cell Body Have nucleus with cytoplasm and organelles Involves integration 3. Axons Move impulses away from cell body Move impulses to another neuron 4. Axon terminals End of axon Contains synaptic end bulbs that connects with dendrites of next neuron Neuroglia = support cells Clean things up Maintain internal environment 4 types 1. Astrocytes Maintain calcium and potassium Form Blood Brain Barrier Keeps junk out of brain 2. Oligodendrocytes Produce myelin in CNS Lipids that produce insulation and speed up action potential 3. Microglia Phagocytosis= cleaning up 4. Ependymal Cells Form cerebral spinal fluid White matter = myelinated axons from lipids VS. Gray matter = unmyelinated axons from cell bodies and dendrites
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