BISC306 Lecture 3: In Class - 3 - Ion Currents and Membrane Potential
1 Oct 2017
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In class - 3 - ion currents and membrane poten. Neurons = electrically excitable cells that process and transmit info. Excitability/excitation: rapid changes in the electrical potential/voltage differe that can be measured across the plasma membrane. Controls the nervous system and ability to perform activities. Neurons communicate with other cells at regions called synapses. Soma of motor neurons - ventral hor cord. Brainbow project l horn of spinal cerebellum cord. In parts of the nervous system they are more abundant than neurons. Experiments in the 18th century by galvani and volta suggest electrical nature nervous stimulation of muscle by a nerve. Experiments using squid giant axons reveals action potential. A stimulus strong enough to cause contraction of muscle produced action potential ley tial. A stimulus strong enough to cause contraction of muscle produced action potential. Resting membrane potential between -20mv to -100 mv. Recording from a neuron stimulated to produce an action potentia.
