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Study Guide for Midterm 1 - BISC 230

Study Guide for Midterm 1 - BISC 230 - Study Guide for BISC...

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Study Guide for BISC 230 1. What are the structural components of the nerve cell? a. The cell surface or membrane is made from phospholipids (bilayer) – why? b. The phospholipid bilayer has transmembrane proteins (ion channels, surface receptors). c. What are the unique structures of nerve cells – axon, axon hillock, presynaptic terminals, postsynaptic receptor specializations, myelin sheath, dendrites, dendritic spines. d. Mitochondria, Endoplasmic reticulum, nucleus, lysosome 2. What determines the cells resting membrane potential? a. Leak K+ channels (not voltage dependent) b. What are the forces that determine the flow of K+ ions (diffusional vs electrotonic)? What is responsible for these two forces (ion distribution difference vs negative charged proteins also called anions) c. What is the usual resting membrane potential – approximately -70 to -60 mV. d. How does the Nernst potential describe this for modeling? 3. What steps take place for an action potential to be produced by a nerve cell? a. The nerve cell depolarizes (loses negativity and goes toward 0) – how? Why? b. The cells membrane potential reaches the “threshold” for changing the conformation of the Na+ channel – voltage dependent conductance!
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