The blood leaving the lungs in the capillary travels to another blood vessel and then to the heart. What are the names of the blood vessel and part of the heart it will first enter?

Blood vessels. These bring blood to the lungs, where oxygen enters the bloodstream, and then to the body:

The inferior and superior vena cava bring oxygen-poor blood from the body into the right atrium.

The pulmonary artery channels oxygen-poor blood from the right ventricle into the lungs, where oxygen enters the bloodstream.

The pulmonary veins bring oxygen-rich blood to the left atrium.

The aorta channels oxygen-rich blood to the body from the left ventricle.

An electrical system that stimulates contraction of the heart muscle.

A network of arteries and veins also carry blood throughout the body:

Arteries transport blood from the heart to the body tissues.

Veins carry blood back to the heart.

Pulmonary vein is the blood vessel which is responsible for the transportation of oxygen rich blood to the heart. Left atrium is the part of the heart which recieves oxygenated blood from the lungs through pulmonary vein.

Explanation: Veins are the blood vessel which carries deoxygenated blood from the cell to the heart except pulmonary vein which carries oxygenated blood from lung to the heart.