handout 1 - Biology 365R Handout for Discussion Sessions of...

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Biology 365R Handout for Discussion Sessions of Monday, September 1 and Wednesday, September 3 Objectives for first lectures : To appreciate the basic role of diffusion in the movement of molecules in solution and across cell membranes. To understand in general terms how molecules move across cell membranes. To understand the problems created for a cell by osmosis. To understand how movements of ions can generate membrane potentials. To understand the structure of a typical nerve cell. To be able to outline the components of and flow of information in a simple reflex. To be able to define in general terms local potentials and action potentials and how this reflex circuit uses these potentials. To understand the resting membrane potential and how it is generated. To understand the consequences of a membrane permeable to more than one ion. Discussion questions : 1. Define (from lecture and/or your readings in the book and notes): homeostasis, osmolarity, osmosis, isotonic, hypertonic, hypotonic, diffusion, active transport, facilitated diffusion, neuron, neuroglia, axon, ganglion, nucleus, soma or cell body, dendrites, axon hillock, nerve impulse, axon terminal, synapse, microtubules, Nissl bodies, efferent, afferent, central nervous system, peripheral nervous system, golgi complex, motor neuron, axoplasmic transport, interneuron, reflex, muscle spindle, chemical transmitter substance, threshold, synaptic potential. 2. A hypothetical cell contains a solution of protein and is bathed in an iso-osmolar solution of sucrose (iso-osmolar signifies the solution has the same concentration of dissolved solute molecules as that present on the inside of the cell). A. Tell why this cell is at equilibrium if the membrane is impermeable to sucrose and the protein molecules. B.
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This note was uploaded on 09/15/2009 for the course BIO 320 taught by Professor Staff during the Fall '08 term at University of Texas at Austin.

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handout 1 - Biology 365R Handout for Discussion Sessions of...

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