Across
- 2. cardiac muscle contraction
- 4. How many valves does the human heart have?
- 5. tubes that pump blood away from the heart
- 7. a valve between the left ventricle and aorta
- 9. How many chambers does an amphibian heart have?
- 11. low blood sugar
- 14. ____is the accumulation of fats (LDL cholesterol) in our arteries
- 15. cardiac muscle relaxation
Down
- 1. ____circuit is when blood flows from the heart to the lungs & skin.
- 3. tubes that have an internal diameter of hairlike thinness
- 6. ____is the expansion of blood vessels (a process of making them wider to increase blood flow)
- 8. another name for red blood cells
- 10. high blood sugar
- 12. tubes that bring blood to the heart
- 13. ____circulatory system is when a pumping structure pumps stuff into a body cavity and bathes the tissues inside