Your heart beats roughly 100,000 times a day, pumping blood through two separate circuits. Explore how double circulation works.
The human heart has four chambers: two upper atria and two lower ventricles, which work together to pump blood through the body.
How many chambers does the human heart have?
Four — two atria and two ventricles
Blood passes through the heart twice in one complete circuit: once through the pulmonary circuit (to the lungs for oxygen) and once through the systemic circuit (to deliver oxygen to the rest of the body).
What is the difference between the pulmonary and systemic circuits?
The pulmonary circuit carries blood between the heart and lungs to pick up oxygen; the systemic circuit carries oxygenated blood from the heart to the rest of the body
What is the difference between an artery and a vein?
Arteries carry blood away from the heart; veins carry blood back toward the heart
1. How many chambers does the human heart have?
2. What are the upper chambers of the heart called?
3. What are the lower chambers of the heart called?
4. What is double circulation?
5. Which circuit carries blood between the heart and the lungs?
6. Which circuit carries blood between the heart and the rest of the body?
7. Do arteries carry blood toward or away from the heart?
8. Do veins carry blood toward or away from the heart?
9. Why does the heart's left side have a thicker muscular wall than the right side?
10. Why is having a double circulation (rather than a single loop) an advantage for humans?