BISC 101 Lecture Notes - Lecture 16: Resting Potential, Multiple Sclerosis, Central Nervous System

• School: Simon Fraser University
• Department: Biological Sciences
• Course: BISC 101
• Professor: Onkar Bains

Document Summary

Three ways co2 is transported in the blood: ^dissolved in plasma=7% Many animals have complex nervous system which consists of: ^electrical and chemical: ^the central nervous system (cns, ^the peripheral nervous system (pns) ^an axon joins the cell body at the axon hillock. ^most neurons are nourished or insulated by cells called glia. There are several types of glia: ^astro(cid:272)(cid:455)tes , ^b(cid:455) i(cid:374)du(cid:272)i(cid:374)g the for(cid:373)atio(cid:374) of tight ju(cid:374)(cid:272)tio(cid:374)s blood-brain barrier. ^oligodendrocytes (in the cns) and schwann cells (cid:894)i(cid:374) the pns(cid:895) : ^in multiple sclerosis . Ion pumps and ion channels maintain the resting potential of a neuron. ^k+ ions slowly move through potassiu(cid:373) leak (cid:272)ha(cid:374)(cid:374)els sodium leak channels. ^there are significantly more potassium leak channels compared to sodium leak (cid:272)ha(cid:374)(cid:374)els . ^while hyperpolarized, the neuron is in a refractory period . ^sodium-potassium in atpase pumps: they are only active during the refractory period, ^ i(cid:374) whi(cid:272)h 3 na+ 2 k+ ions. ^the (cid:374)eurotra(cid:374)s(cid:373)itter diffuses a(cid:272)ross the (cid:374)arrow gap synaptic cleft.