01:119:116 Lecture Notes - Lecture 19: Axon Hillock, Resting Potential, Action Potential
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Conduct messages as electrical signals and integrate information. A. c)many shapes and sizes all have similar components. All neurons use the same type of signal, what makes things different is where the signal goes. Two types of cytoplasmic extensions: axons and dendrites: neuron anatomy. Transmits neural impulse away from cell body to (b. b. 1. i) another neuron (b. b. 1. ii) Base of axon extending from cell body (b. c. 3) End of axon divides (usually) into many branches. B. e)nerve: axons of many neurons, held together with connective tissues. Result is that there is a different in percent of ions inside (cytosol) and outside (extra-cellular fluid) of a membrane this difference is the membrane potential. C. b)only excitable cells can rapidly generate changes in membrane potential nerves and muscles. C. c) voltage measures membrane potential: resting potential. Resting potential between -60 and -80 mv (d. a. 1) 70 mv = maintained by the sodium-potassium pump and ion channels. Sodium-potassium pump 3na out, 2 k into cell.