Deepen your understanding of the heart's structure, blood vessels, and the composition of blood.
The heart has four chambers: two atria (upper) and two ventricles (lower), which pump blood through the body in a double circulation system.
How many chambers does the human heart have?
Four — two atria and two ventricles
What is 'double circulation'?
Blood passes through the heart twice per complete circuit — once to the lungs and once to the body
Why does the heart need two separate sides (left and right) rather than just one pump?
The right side pumps oxygen-poor blood to the lungs, while the left side pumps oxygen-rich blood to the rest of the body, keeping the two blood supplies separate for efficiency
Blood consists of plasma (liquid part), red blood cells (carry oxygen), white blood cells (fight infection), and platelets (help clotting).
What component of blood carries oxygen?
Red blood cells
What component of blood helps blood clot after an injury?
Platelets
What is the liquid part of blood called, and what does it carry?
Plasma; it carries blood cells, nutrients, hormones, and waste products throughout the body
1. How many chambers does the heart have?
2. What are the upper chambers of the heart called?
3. What are the lower chambers of the heart called?
4. What blood component carries oxygen?
5. What blood component fights infection?
6. What are the two lower chambers of the heart called?
7. What are the two upper chambers of the heart called?
8. What component of blood helps it clot after an injury?
9. What is plasma?
10. Why does the left side of the heart have thicker muscle walls than the right side?