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Chapter 37 - Circulatory and Respiratory Systems
Across
6. cell fragment released by bone marrow that helps in blood clotting
8. pathway of circulation between the heart and the rest of the body except the lungs
10. muscular tube at the end of the gastrovascular cavity, or throat, that connects the mouth with the rest of the digestive tract and serves as a passageway for air and food
11. upper chamber of the heart that receives and holds blood that is about to enter the ventricle
12. smallest blood vessel; brings nutrients and oxygen to the tissues and absorbs carbon dioxide and waste products
14. large, flat muscle at the bottom of the chest cavity that helps with breathing
Down
1. pathway of circulation between the heart and the lungs
2. straw-colored fluid that makes up about 55 percent of blood
3. thick middle muscle layer of the heart; pumps blood through the circulatory system
4. lower chamber of the heart that pumps blood out of the heart
5. fluid lost by the blood into surrounding tissue
7. in plants, a cluster of vascular tissue in leaves; in animals, a blood vessel that returns blood to the heart
9. iron-containing protein in red blood cells that transports oxygen from the lungs to the tissues of the body
10. small group of cardiac muscle cells in the right atrium that “set the pace” for the heart as a whole; also known as the sinoatrial node
13. large blood vessel in mammals through which blood travels after it leaves the left ventricle