What is the term for the mechanism where oxygen is released into tissues and carbon dioxide is taken in?

The correct term for the mechanism where oxygen is released into tissues and carbon dioxide is taken in is internal respiration. This process occurs at the cellular level, where oxygen diffuses from the blood into the cells, and carbon dioxide, which is a waste product of cellular metabolism, diffuses from the cells into the blood.

In contrast, external respiration refers to the exchange of gases between the air in the lungs and the blood, specifically the intake of oxygen and the release of carbon dioxide during breathing. Diastole is a phase of the cardiac cycle when the heart muscle relaxes, allowing the chambers to fill with blood, and dialysis is a medical procedure to remove waste products and excess fluid from the blood when the kidneys are not functioning properly. Understanding these distinctions aids in grasping the overall concept of respiration and its importance in human physiology.