Angiotensin II is a substance which is made by the body. It works on the cardiovascular system, narrowing the blood vessels which can lead to high blood pressure. It also releases a hormone which increases the amount of sodium in the body. ARBs block the receptor sites which allow them to work and help to relax the blood vessels.
Regular Websites
Angiotensin-II Receptor Antagonists: Their Place in Therapy
American Family Physician offers this clinical pharmacology article regarding how these blockers are used in the pathophysiology of hypertension. - Angiotensin-II Receptor Antagonists: Their Place in Therapy
http://www.aafp.org/afp/990600ap/3140.html
NIH: Angiotensin II Receptor Blockers
The National Institutes of Health furnishes data about these agents including the pharmacology and special patient considerations. - NIH: Angiotensin II Receptor Blockers
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC1200815/
Texas Heart Institute: Angiotensin II Receptor Blockers
The famed cardiac hospital sets forth information about angiotensin II receptor blockers which includes the method in which they work, dosage details, and possible adverse effects. - Texas Heart Institute: Angiotensin II Receptor Blockers
http://www.texasheartinstitute.org/HIC/Topics/Meds/angimeds.cfm