1. explain the function of the heart in the circulatory system?
2. describe the function of the lungs in the circulatory system?
3. why do you think it would be very dangerous to lose a quart of blood in an accident?
( explain all in a short form if you can)
ttt

1. the hearts job is to propel blood throughout the body
2. i think the lungs trade CO2 for O2
3. they would go into hypothermic shock or something:p

1. The circulatory system is composed of the heart and blood vessels, including arteries, veins, and capillaries. As a hollow, muscular pump, its main function is to propel blood throughout the body.
2. Arterial blood (red, oxygen-rich blood) flows from the heart to each part of the body to provide oxygen and nutrients. The venous blood (blue, oxygen-poor blood) returns from the body to the heart. The blood then travels through the lungs to exchange carbon dioxide for new oxygen.