Cells usually transfer the energy that is released directly to what

Cells usually transfer the energy that is released directly to ATP.

ATP is a molecule in the cells that temporarily stores energy when it is not needed  then releases it when it is needed.

ATP stands for adenosine triphosphate. It can be used in different chemical reactions and has thus been named the universal  energy currency. When broken down, a portion of the energy released from ATP particles creates even more ATP, repeating the process of energy production. 

ATP aids in cell efficiency by ensuring that cells lose only minimal amounts of energy.

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.