BIO 012 Lecture Notes - Lecture 21: Pulmonary Artery, Angiotensin, Heart Valve
Document Summary
Renin is released from the juxtaglomerular cells of the kidney after the large number of mechanoreceptors on these cells detect a change in blood pressure. Angiotensin is a type of hormone that can cause an increase in blood pressure by initiating vasoconstriction within arteries. It has an inactive form (angiotensin i) and an active form (angiotensin ii) Renin interacts with angiotensin in such a way that it experiences a conformational change into its active form. The body uses a negative feedback loop for blood pressure concentrations. The body uses a positive feedback loop in the process of removing a build-up of wastes from within the constricted arteries. Parts of the heart responsible for on test 3: Anterior (superior) vena cava- returns deoxygenated blood back to the heart from the upper part of the body. Posterior (inferior) vena cava- returns deoxygenated blood back to the heart from the lower part of the body. Right atrium-receives blood from the two vena cavae.
