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).
Â· just now. Report Abuse. 3 ATP molecules are produced per turn of the Krebs cycle (if you are being more precise then it is 2.5 ATP). Remember that the cycle occurs twice for every glucose molecule/hexose sugar broken down, so if you want the total per molecule of glucose you have to double it. Ryan D Â· 7 years ago. Thumbs up.