Answer: The heart consists of four chambers, two atria (upper chambers) and two ventricles (lower chambers). There is a valve through which blood passes before leaving each chamber of the heart. The valves prevent the backward flow of blood.
A celery stick with peanut butter and 1/2 of apple juice but if your only talking about 1 thing then 1/2 of apple juice bc he could easily choke on the celery
