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Ch.12 notes

by: Erica Notetaker

Ch.12 notes BIOL 240

Erica Notetaker
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About this Document

these notes focus on chapter 12 nervous system
Human Anatomy & Physiology I
Ashley Jabs
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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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