👉 A capsula is a type of capillary, which is an organ in the human body that collects and transports blood from the heart to various parts of the body. It is made up of two layers - an outer layer called the capillaries and a thin inner layer called the venous sinus. The outer layer of the capillary collects the blood, while the venous sinus facilitates the exchange of oxygenated blood with deoxygenated blood.