This exchange process takes place in the aveolus (air sac) inside your lungs by diffusion. it's from a different concentration gradient the deoxygenated blood with carbon dioxide diffuse into a aveoli (which is in high concentration) and the aveoli release the oxygen into the blood stream (which is low concentration) therefore the blood will be oxygenated again
Chloroplasts are the tiny structures in plants cells where photosynthesis happen. chloroplasts contain chlorophyll , a green pigment that absorb light energy for photosnthesis
