Final answer:
Carbon dioxide (CO2) is the molecule that diffuses out of the cell, enters the bloodstream, and gets released from the lungs during aerobic cellular respiration.
Step-by-step explanation:
The molecule that will diffuse out of the cell, enter the bloodstream, and be released from the lungs during aerobic cellular respiration is carbon dioxide (CO2). During the process of cellular respiration, cells consume oxygen and glucose to produce energy, water, and carbon dioxide. Oxygen is taken up by cells for use in the metabolic process, while carbon dioxide, a waste product generated by cells, is transported back to the lungs to be expelled from the body.
Both oxygen and carbon dioxide use simple diffusion to move in and out of cells. While the bloodstream supplies cells with oxygen, carbon dioxide is continuously produced by cells and enters the bloodstream because its partial pressure is higher in the tissue than in the blood. Carbon dioxide is then conveyed to the lungs and removed from the body when we exhale.