Across
- 2. activity is steady enough to allow the heart to supply all the oxygen your muscles need
- 3. carries blood away from the heart to another part of the body
- 7. made up of your heart, blood vessels, and your blood
- 9. helps improve your cardiovascular fitness
- 10. is a more vigorous type of aerobic activity that elevates the heart rate
Down
- 1. a fatlike substance found in meats, dairy products, and egg yolks
- 4. made up of your lungs and the air passages that bring air, including oxygen, from outside the body into the lungs
- 5. a muscle that acts as a pump to supply blood to your body cells
- 6. means "with oxygen"
- 8. carries blood filled with waste products from the muscle cells back to the heart
- 11. the number of heart beats per minute when relatively inactive