Labeling the parts of a cell on a diagram is an example of an exercise in

Anatomy

Explanation:

Anatomy is the branch of biology that is concerned with description and identification of the body structures of the living things. It is quite old and its beginning lies in prehistoric times. It is divided into two parts microscopic and macroscopic anatomy. Human anatomy is among essential basic sciences, applied in medicine and helps to understand the structure of the human body and functions of the organs.

the oxygenated blood then leaves the lungs through pulmonary veins, which return it to the left heart, completing the pulmonary cycle. this blood then enters the left atrium, which pumps it through the mitral valve into the left ventricle. from the left ventricle, the blood passes through the aortic valve to the aorta.

deoxygenated blood leaves through the right ventricle through the pulmonary artery. from the right atrium, the blood is pumped through the tricuspid valve (or right atrioventricular valve), into the right ventricle.