A heart is just like a pump. It is responsible for blood circulation all over the body. the blood is carried by blood vessels. There are five great vessels enter and leave the heart. They are the superior and inferior vena cava, the pulmonary artery, the pulmonary vein, and the aorta.
Photolysis can be defined as a chemical decomposition( separation of molecules ) induced by light or other gradient energy. It is also called Photodissociation or photodecomposition.