👉 Renninogen is a type of protein that plays a crucial role in the function of the kidney. It is composed of two types, renin and glomerular basement membrane (GBM), which are essential for maintaining proper blood volume and electrolyte balance. Rennin is a hormone secreted by the kidneys to regulate blood pressure and maintain homeostasis. It acts as a regulator of sodium and water reabsorption in the nephron, thereby helping to control blood volume and fluid retention.