Respiratory System

2. A large sheet of muscle that separates the lungs from the abdominal cavity
6. The many small, branching tubules into which the bronchi subdivide.
9. Sets of muscles between the ribs which raise and lower the rib cage.
10. When particles spread out from a region of higher concentration to a region of lower concentration.
11. The ribs and upper backbone, and the organs found in the chest

1. A gaseous compound of carbon and oxygen, which is a by-product of respiration, and which is needed by plants for photosynthesis.
3. The plural of 'bronchus'. The bronchi are the two major air tubes in the lungs.
4. Tiny air sacs in the lungs, where gas is exchanged during breathing.
5. Thin, moist membranes surrounding the lungs that make an airtight seal.
7. The major airway in the respiratory system, also known as the windpipe, connecting the pharynx and larynx to the lungs
8. Tiny hair-like projections from a cell that usually allow it to move a substance past the cell