Outline 31 2008 How neurons work

Outline 31 2008 How neurons work - Lecture 31: HOW NEURONS...

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Lecture 31: HOW NEURONS WORK Summary . Neurons, or nerve cells, work by generating electrical action potentials that propagate at high velocity down the axon of the cell. The action potential is dependent upon fast acting voltage-sensitive ion channels in the nerve membrane that are selective to different cations, sodium and potassium. The nerve cell membrane acts like an electrical battery, charged by ion pumps that maintain a concentration gradient of both potassium ions and sodium ions across the membrane. The pumps are ATP driven. Ion channels are extremely diverse, but evolutionarily related. Reading Assignment Campbell, N. A. and Reece, J. B. (2008). 8 th edition. Chapter 48 (pp. 1047-1056). Objectives 1. To be able to explain how the need for speed necessitated the evolution of the nervous system. Explain how delays of seconds or minutes for hormonal control systems gets shortened to delays of seconds or milliseconds. 2.
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Outline 31 2008 How neurons work - Lecture 31: HOW NEURONS...

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