PNB 2XB3 Lecture 2: PNB 2XB3 - Lecture 2 Notes
23 Sep 2018
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This makes the inside negative, counteracting the diffusion tendency (since opposite charges attract). This makes the inside positive, counteracting the diffusion (tendency) since like charges repel. At some pint, the inside will be sufficiently positive that no net flow of na+ will occur: because k+ and x++ have the same concentration gradient, they will have the same tendency to diffuse out of the cell. The identical force of attraction will therefore be needed to keep them from leaving the cell. Pathway from finger to brain has been damaged: electrical brain stimulation. Stimulate a part of the brain then we will feel out finger tingling even though nothing is touching it: stroke, we sense the past (time from stimulus to perception) Ppl have damaged specific parts: close to brain: perception occurs with little delay, conduction speed = 30-70 m/s, farther from brain: perception occuts eith longer delay. If he is speaking, we hear it a little later.
