The kidneys regulate the blood pressure by a hormonal mechanism called the renin angiotensin aldosterone mechanism. This is done by the juxtaglomerular cells in the kidney which produce renin, when the blood pressure falls.
Renin in turn converts plasma protein angiotensin to angiotensin I which in turn is converted to angiotensin II in the lungs. Angiotensin II constricts the blood vessels throughout the body, thus raising the blood pressure.
Angiotensin II also stimulates the adrenal cortex to secrete aldosterone, which retains water and decreases the urine output, thus increasing the blood volume and the blood pressure.
thank you very much Dr. Anitha - another question - first i do have a decent understanding of positive and negative feedback, but am not a doctor or have that kind of advanced education. but given the info you provided is it safe to assume that if the adrenal gland is not working properly and is unable to secrete enough aldosterone to raise the bp when it is necessary then will the bp bottom out. especially the dyastolic bp (do not have a bleed). thank you very much for your help. please do not ask me to go see my doctor. thanks
Copyright 1994-2017MedHelp International.All rights reserved. MedHelp is a division of Aptus Health.
The Content on this Site is presented in a summary fashion, and is intended to be used for educational and entertainment purposes only. It is not intended to be and should not be interpreted as medical advice or a diagnosis of any health or fitness problem, condition or disease; or a recommendation for a specific test, doctor, care provider, procedure, treatment plan, product, or course of action. Med Help International, Inc. is not a medical or healthcare provider and your use of this Site does not create a doctor / patient relationship. We disclaim all responsibility for the professional qualifications and licensing of, and services provided by, any physician or other health providers posting on or otherwise referred to on this Site and/or any Third Party Site. Never disregard the medical advice of your physician or health professional, or delay in seeking such advice, because of something you read on this Site. We offer this Site AS IS and without any warranties. By using this Site you agree to the following Terms and Conditions. If you think you may have a medical emergency, call your physician or 911 immediately.