The respiratory movements (inspiration and expiration) enable the renewal of the air in the lungs.

Blood is a complex fluid  that transports a variety of molecules around the body. It carries diatomic Oxygen and the nutrients essential for the organism to function, but it also carries the wastes  produced by these same organs (Carbon Dioxide, nitrogenous wastes).

It also carries the many molecules associated with the immune system, and diffuses hormones throughout the organism.

A heart cycle corresponds to one heartbeat. During the cycle, the left and right sides of the heart are synchronized. When the cardiac muscle (myocardium) relaxes, the blood carried by the veins fills the heart cavities (atriums and ventricles). When the myocardium contracts, the blood is forced out of the heart into the arteries.

A visualization in three phases of the cardiac cycle.

Here you have the anatomy of the human heart. The heart is a muscular pump divided into two separate but physically joined organs - the right heart and the left heart.

The body's circulatory system has two distinct parts; pulmonary circulation (Lungs) and systemic circulation (other organs). Blood flows in one direction through the blood vessels – arteries, veins, capillaries – forming a closed system that irrigates all of the body’s organs. The heart and its coronary circulation (not represented here) is the central organ of this system, which, via the rhythmic pumping of the heart, makes about 5 liters of blood continually travel through the body’s blood vessels.

The respiratory system supplies the blood with oxygen to be delivered to all parts of the body. The system does this through breathing. The air we breathe in (inhalation) is rich in oxygen, which is used by body tissues to maintain life functions. We exhale the carbon dioxide that these tissues produce as a waste product. The parts of the respiratory system are the oral and nasal cavities, the trachea, the bronchi, and the lungs.
More than 300 million alveoli lie at the final stage of this process.  Zooming in will enable you to see the gas exchange going on at the level of these tiny structures.
You also have access to numerical data on the composition of inhaled and exhaled air, and of oxygenated and deoxygenated blood.