PHGY 209 Study Guide - Final Guide: Reticular Formation, Suprachiasmatic Nucleus, Preoptic Area

• School: McGill University
• Department: Physiology
• Course: PHGY 209
• Professor: Melissa Vollrath

Document Summary

In our tongue, there is about 10 000 taste buds (on papillae). Protons (h+) usually block ion channels or interfere w/ their function (ex. take the place of na+ in sodium channels or block k+ in potassium channels). That"s (cid:449)h(cid:455) li(cid:272)ki(cid:374)g salt a(cid:374)d the(cid:374) taki(cid:374)g te(cid:395)uila (cid:396)e(cid:373)o(cid:448)es the salt(cid:455) se(cid:374)se (cid:894)a(cid:272)id i(cid:374)te(cid:396)fe(cid:396)e (cid:449)/ salt(cid:455) se(cid:374)satio(cid:374) (cid:396)e(cid:272)epto(cid:396)s(cid:895). Bitter sensation is a protection to prevent us from eating the wrong thing. Umami is a flavor enhancement used in a lot of food these days. We can differentiate about 10 000 odors, against 5 gustative modalities. There are only roughly 1000 different receptors in olfactory system. Odorant molecules have different degree of affinity w/ each so we can distinguish. Olfa(cid:272)to(cid:396)(cid:455) se(cid:374)satio(cid:374) does(cid:374)"t go to the thala(cid:373)us like othe(cid:396) se(cid:374)so(cid:396)(cid:455) s(cid:455)ste(cid:373)s. The limbic system is involved in a lot of emotional responses so olfaction has a direct connection w/ the part of brain regulating emotions.