Across
- 3. It happens when oxygen from the air enters the lungs.
- 4. The smallest blood cells.
- 7. The liquid component of the blood.
- 10. The other term for red blood cell which is the most abundant blood cell.
Down
- 1. It is a hollow muscular tubular structure also known as windpipe.
- 2. It is composed of the heart, blood, and blood vessels.
- 5. The main organs of the respiratory system.
- 6. It happens when the air is forced out of the lungs.
- 8. It separates the left and the right side of the heart.
- 9. It defends the body from microorganisms that can cause infection.