body system

2. a hollow part or cavity in an organ.
4. Tiny hair-like projections that line the inside of the small intestine
7. takes blood to the heart
8. any of the fine branching blood vessels that form a network between the arterioles and venules.
12. A type of blood cell that is made in the bone marrow and found in the blood.
13. each of the pair of organs situated within the rib cage, consisting of elastic sacs with branching passages into which air is drawn
14. a large membranous tube reinforced by rings of cartilage, extending from the larynx to the bronchial tubes and conveying air to and from the lungs; the windpipe

1. any of the many tiny air sacs of the lungs which allow for rapid gaseous exchange.
3. A type of blood cell that is made in the bone marrow and found in the blood and lymph tissue
5. any of the minute branches into which a bronchus divides.
6. the colorless fluid part of blood, lymph, or milk, in which corpuscles or fat globules are suspended.
9. carries blood away from heart
10. a small colorless disk-shaped cell fragment without a nucleus, found in large numbers in blood and involved in clotting
11. any of the major air passages of the lungs which diverge from the windpipe.
15. each of the two upper cavities of the heart from which blood is passed to the ventricles.