What tissues will give co2 to the blood in exchange for o2?

Tissues throughout the body, particularly those with high metabolic activity such as muscles and organs, will give carbon dioxide (CO2) to the blood in exchange for oxygen (O2). This exchange occurs primarily in the capillaries, where oxygen is delivered to tissues, and CO2, a byproduct of cellular respiration, is transported back to the bloodstream. The process is facilitated by diffusion, allowing gases to move from areas of higher concentration to areas of lower concentration.