Answer the following question given this paragraph: The organs that make up the cardiovascular system are the heart and a network of blood vessels that run throughout the body. The blood in the cardiovascular system is a liquid connective tissue. Figure below shows the heart and major vessels through which blood flows in the system. The heart is basically a pump that keeps blood moving through the blood vessels. Q: The heart and a network of blood vessels that run throughout the body make up what organ system? Choices: - lymphatic system - respiratory system - immune system - cardiovascular system A:
A:
cardiovascular system