BIO 11 Lecture Notes - Lecture 17: Cardiac Muscle, Low-Density Lipoprotein, Paracrine Signalling
Document Summary
Gap junction two cell membranes are connected by channel proteins called. Allows to cells to communicate between each other with chemicals between the channels. Intercalated disks in cardiac muscle use gap junctions to quickly talk to each other because the contraction of the entire muscle has to go at the same time. Local hormones travel through intercellular (in the cell) fluid ; take forever where they need to go; therefor, they"re the third line of defense. Exactly related to amino acids - basic building blocks of proteins. Tryptophan derivatives; melatonin (skin and sleep cycle) Fewer amino acids than amino acids hormones/proteins. Polypeptide chains ; inactive hormones when they are made. Hdl - good, take away ldl and bring back to liver. Ldl - bad, travel away from liver and clog arteries, but are also used to make hormones like testosterone, estrogen, progesterone. Eicosanoids; paracrine hormones for local hormonal control.
