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.
Immunity and Spread of Infection. The lymphatic system plays an integral role in the immune functions of the body. It is the first line of defense against disease. This network of vessels and nodes transports and filters lymph fluid containing antibodies and lymphocytes (good) and bacteria (bad).
Answer:
true its an alergic reraction
Explanation:
You’re answers C because if you swerve into the opposite lane you could hit someone and if you stop it could mess up traffic