Across
- 1. valve closes during systole
- 3. Insects have an … circulatory system
- 8. Excess … is picked up and collected in lymph capillaries and returned to the circulation
- 10. Average blood pressure of an adult
- 11. Blood Clotting also called …
- 12. single-celled organisms and some simple multicellular ones can exchange substances … with their environment
- 16. In a … -chambered heart total separation of oxygenated and deoxygenated blood is possible
- 17. contain a small amount of Muscle and elastic fibres
- 19. exchange materials between tissues and blood
- 20. AB- is the … Blood type
Down
- 2. body’s defense against disease
- 4. the most numerous blood cells
- 5. the SA nod or … generates wave of signals to contract
- 6. narrow lumen
- 7. blood flows in to the heart
- 9. the heart contracts as an reaction to … impulses
- 13. Arteries have a outer layer made of … to prevent rupturing
- 14. Ventricles … during systole
- 15. muscular pump
- 18. The heart is surrounded by a … layered wall