Can You Pass This Science Quiz for Grades 3-5?
QUESTION 79-Special "doors" in the cardiovascular system that ensure blood flows in the correct direction are called ______.
Correct Incorrect Valves---Valves in the cardiovascular system serve as one-way doors that regulate the flow of blood in the proper direction. There are four main valves in the heart: the aortic valve, tricuspid valve, pulmonary valve, and mitral valve. These valves open and close to allow blood to flow through the heart chambers and prevent backflow.