Across
- 1. What direction do arteries pump blood from the Heart?
- 3. What do white blood cells fight?
- 7. Does the small intestine have a small or large surface area?
Down
- 1. What do lymphocytes produce against microbes?
- 2. How many substances does one kind of enzyme break down?
- 4. Phagocytes ? the Microbe.
- 5. What direction do veins pump blood from the heart?
- 6. What gas does blood carry?