HMB200H1 Lecture Notes - Lecture 9: Per1, Halorhodopsin, Ligand-Gated Ion Channel
Document Summary
Lecture 9: circadian rhythms all animals adapt behavior to light cycle. Nocturnal vs. diurnal strategies. To be up when there"s light and the organism can see things. Use light cycle to find animals. All plants and animals have internal clocks to maintain their metabolic and behavioral rhythms. Clocks must be influenced by light, and must work together to coordinate metabolism and behavior. Also need to be able to maintain this rhythm when its dark. Heart: generation of energy for the beating of the heart also depends on the light cycle. These internal rhythms are determined by a small number of internal clock genes. These internal clock genes are very similar in flies, rodents, and humans very strongly preserved across all animals. These clock genes influence when we are active, quiet and sleep, and also all metabolic rhythms of the body. Circadian rhythm in mammals: controlled by the suprachiasmatic nucleus. Circadian rhythm in birds: controlled by the pineal glands.
