PSYC 2000 Chapter : PSYC Lecture Ch 2
Document Summary
Glia cells: 90% of the cells in our nervous system are glial cells, supportive role: provide nutrients, repair damage, form myelin, get rid of waste , 10% are neurons. Clinical connection: multiple sclerosis: immune system attacks the cns, and destroys myelin (and consequently nerve tissue) which causes scarring; the scar tissue distorts or interrupts nerve impulses. Oligodendrocytes: produce myelin for neurons for the cns (brain and spinal cord). Dendrite excites and send signal to soma, which then sends a message to the axon. The na+ is attracted to the k- in the cell. They set off a na+ gate, which lets na+ into the cell. There is too much in the cell now, so the k- gate lets some potassium out. This is how the message is sent down the neuron. This gate takes in even more na+ into the cell. Then the na+ pump shoos the na+ out.
