Across
- 1. either of the two saclike respiratory organs in the thorax of humans and the higher vertebrates.
- 7. a group of organs that perform a certain task
- 9. either of a pair of bean-shaped organs in the back part of the abdominal cavity that form and excrete urine. bladder a membranous sac or organ serving as a receptacle for a fluid or air.
- 12. muscular wall separating two cavities or limiting a cavity.
- 13. a specialized part of a cell having some specific function; a cell organ.
- 15. the tendency of a fluid, usually water, to pass through a semipermeable membrane into a solution
- 17. part of the central nervous system enclosed in the cranium of humans and other vertebrates neuron a specialized, impulse-conducting cell that is the functional unit of the nervous system
- 18. the anterior and largest part of the brain, consisting of two halves or hemispheres and serving to control movements and actions
- 20. to act or perform again
- 21. one of the minute, wormlike processes on certain membranes
Down
- 2. the cord of nerve tissue extending through the spinal canal of the spinal column
- 3. one of the minute blood vessels between the terminations of the arteries and the beginnings of the veins.
- 4. a form of life composed of mutually interdependent parts that maintain various vital processes.
- 5. having or consisting of a single cell.
- 6. an aggregate of similar cells and cell products forming a definite kind of structural material with a specific function, in a multicellular organism.
- 8. act of diffusing; state of being diffused
- 10. blood vessels that carry blood away from the heart
- 11. trachea the tube in humans extending from the larynx to the bronchi nerves
- 13. grouping of tissues into a distinct structure,that performs a specialized task.
- 14. to act one upon another
- 16. a soft, fatty, vascular tissue in the interior cavities of bones that is a major site of blood cell production
- 19. either of the two main branches of the trachea