H1-antihistamines work by binding to histamine H1 receptors in mast cells, smooth muscle, and endothelium in the body as well as in the tuberomammillary nucleus in the brain; H2-antihistamines bind to histamine H2 receptors in the upper gastrointestinal tract, primarily in the stomach.
3 NADH molecules and 1 FADH molecule is produced for every turn of the Krebs cycle. One molecule of glucose will result in two turns of the Krebs cycle because two pyruvate molecules are the result of one glucose molecule (pyruvate if fed into the Krebs cycle after it is converted into acetyl-CoA).
The purpose of kreb cycle to generate the stuff needed for ETC electron transport chaing, both FADH and NADH+H gives the H up and use it to give energy to the electron and also move it across the mitochondria membrane and make Chemiosmosis possible. Source(s): beastmaster Â· 6 years ago.