BIOL 155 Lecture Notes - Lecture 7: Axon Hillock, Myelin, Semipermeable Membrane
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Ubc biol 155 lecture 6 notes nervous system. Some form a scaffolding or glue, which holds the nervous tissue together. Some assist neurons by maintaining optimal environment around them two types form myelin, which plays an important role in regulating the speed with which nerves conduct information (action potentials). Functional classification of neurons: sensory neurons (unipolar and some bipolar, all afferent - they conduct action potentials from sensory receptors to the. [na+] is 10-12x higher outside the cell compared to inside the cell. [k+] is 30x greater inside the cell compared to outside the cell. The inner membrane face is always relatively more negative than outer face (at resting potential) All cells in the body have an unequal distribution of ions (concentration gradient) and charged molecules (electrical gradient) across their membranes. Indeed, all have a net negative balance inside relative to outside (differences are always expressed as inside relative to outside).
