Angiotensin II is a peptide hormone that plays a key role in regulating blood pressure and fluid balance in the body. It is a potent vasoconstrictor, meaning it causes blood vessels to constrict, which can increase blood pressure. Research in this area typically focuses on understanding the effects of angiotensin II on the cardiovascular system and its involvement in various diseases such as hypertension, heart failure, and kidney disease. Additionally, researchers study the mechanisms by which angiotensin II is produced and signals within the body, as well as potential therapeutic targets for modulating its activity.