G. An explanation of the Genetic Code: DNA is a two-stranded molecule. Each strand is a polynucleotide composed of A (adenosine), T (thymidine), C (cytidine), and G (guanosine) residues polymerized by dehydration synthesis in linear chains with specific sequences.
Note: There are more than two types of epinephrine receptors on smooth muscle cells, so epinephrine may affect smooth muscle in other tissues in other ways. (There are subtypes of alpha and subtypes of beta.) * Details of how PLC generates IP3 are on handout 12A. We will go over this later.
Norepinephrine-these hormones are Sympathomimetic (they imitate the effects of the sympathetic nervous system and produce fight or flight responses) Pancreas-is both an endocrine and a exocrine gland (heterocrine) - has special areas called islets of Langerhans with four types of cells: 1.7. Effects of Hormones 1. regulates chemical composition of extracellular fluids. 2. regulate metabolism and energy balance 3. function in the contraction of the heart muscle and visceral muscles.