Across
- 4. cells that help form blood clots to stop bleeding
- 8. two upper chambers known as the
- 9. the cycle that involves filling the heart with blood
- 10. during exposure to cold environments, heat loss escapes through the skin
- 11. two lower chambers known as the
- 12. is the amount of blood pumped out of the heart per minute
- 14. form a major part of the immune system
- 16. develops when the body gains more heat than it loses.
Down
- 1. carry oxygen to working muscles and other cells and remove carbon dioxide
- 2. literally means 'same state'
- 3. clear yellowish fluid that carriers nutrients
- 5. heart is referred to as a.....
- 6. a widening or opening of the blood vessels
- 7. reduces blood flow to tissues
- 13. make up the vascular network through which all blood flows to all parts of the body
- 15. is a measure of how much blood is squeezed out of the heart into the aorta