NSCI 1001 Lecture 2: Class 2 - Electrical Signaling
15 Feb 2019
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Document Summary
The nervous system comprises different types of cells. Provide structural & metabolic support for neurons. Various brain injury models have demonstrated that ng2 cells adjacent to the damage site could increase in number and become hypertrophic (meaning increase in volume). However, there is no clear evidence indicating the function of ng2 cells in the adult brain. Discussion: the function of ng2 cells in the adult brain is still uncertain. Basically neurologists know these exist and have theories on it"s function but haven"t found a clear answer. Asymmetric distribution of ions (there is a different concentration of ions inside and outside of the cell which allow for it to be a charge) At rest, the membrane is mainly permeable to potassium (k+) The protein can change shape to create (something) to let ions pass. There are separate channels for different ions (sodium, calcium, potassium channels) Ion channels are selective for specific ions.
