cells and body systems

3. small, pliable cells with no nucleus that are specialized for carrying oxygen to all cells of the body
5. waste removal
6. small finger-like projections on the inner surface of the small intestine that absorb nutrients
9. made of more than one cell
10. substance created by the body to carry out chemical digestion
11. blood vessels that return blood from the body to the heart
14. wave-like muscles contractions along the digestive system
16. a group of tissue that work together to form a specific function
17. physical breakdown of food into small particles
21. large muscle below the lungs that moves air on and out of the lungs
22. tiny air-filled sacs in the lungs, sight of gas exchange
23. thick-walled blood vessels that take blood away from the heart to the rest of the body
24. type of connective tissue found in the bones that produce red blood cells
25. made of just one cell

1. breakdown of large food particles into smaller particles by enzymes
2. a membrane with small openings that allow particles of some substances but not others to pass through
4. a living thing
7. specialized cells of the nervous system that receive and transmit information
8. help to stop bleeding at cuts/open wounds
12. the basic unit of life
13. group of similar cells working together to perform a specific function
15. blood cells specialized to fight infection
18. filtering units of the kidney that removes waste from the blood and produce urine
19. tiny blood vessels that connect arteries to veins, one cell layer thick and extremely narrow
20. group of organs that work together to perform a certain task