What process allows oxygen to pass from blood into tissue?

The process that allows oxygen to pass from blood into tissue is diffusion. Diffusion is the movement of molecules from an area of higher concentration to an area of lower concentration. In the context of the circulatory system, oxygen is present in higher concentration in the blood compared to the surrounding tissues. As a result, oxygen naturally moves out of the blood vessels and into the tissues where it is needed for cellular respiration and metabolic processes.

This process is critical for tissue health and function, enabling cells to obtain the essential oxygen required for energy production. The efficiency of diffusion is influenced by factors such as the concentration gradient, temperature, and surface area available for gas exchange. In the case of respiratory function, the oxygen moves from the alveoli in the lungs into the bloodstream through similar diffusion principles before eventually reaching the tissues.

Other processes mentioned, such as respiration, filtration, and osmosis, do not specifically describe the transfer of oxygen from blood to tissue in the same direct manner as diffusion does. Therefore, diffusion is the most accurate and relevant answer in this context.