PHYSL212 Lecture Notes - Lecture 13: Metabotropic Receptor, Rhodopsin, Ion

• School: University of Alberta
• Department: Physiology
• Course: PHYSL212
• Professor: Jamie Mitchell

Document Summary

Physl 212 - lecture #13 - vision pt. Cells of the eye: choroid nourishes eyes. Low acuity pathways (lots of info condensed down before leaving retina) Dark vision: cells depolarize and are active, but nothing really actually happens. Calcium channels open in synaptic terminals (cid:1371) [glutamate] (ipsp) - exocytose. No a. p. in ganglion cell (part of optic nerve) In lgn (thalamus) (cid:1373) (cid:1373) (cid:1373) (cid:1373) (cid:1373) (cid:1373) (cid:1373) Breakdown of cgmp (cid:1373) (cid:1373) (cid:1373) (cid:1373) (cid:1373) cgmp (cid:1373) (cid:1373) (cid:1373) inhibitory transmitter (cid:1373) (cid:1373) (cid:1373) (cid:1373) Key point: calcium channels determine the release of glutamate, which affects whether you see something or not: rods and cones do not generate a. p. Too many synapses and nerve endings in small area = could cause cross a. p. Thus this is accomplished with graded potentials (hyperpolarize, depolarize: only ganglion cells conduct a. p. because it transmits the info back to the lgn.