| A | B |
|---|
| job of respiratory system | get oxygen into body; remove carbon dioxide & water from body |
| respiration | energy-releasing process that is fueled by oxygen |
| nose | warms, moistens & filters incoming air using mucus & cilia |
| throat (pharynx) | carries air into trachea |
| epiglottis | flap of tissue that directs air down respiratory path (covers esophagus) |
| trachea (windpipe) | cleans & carries air into bronchi; cartilage rings, rigid |
| bronchi | 2 tubes that carry air into lungs |
| bronchioles | bronchi go smaller and smaller in lungs |
| lungs | main organ of respiration; gas exchange (O2, CO2) |
| alveoli (part 1) | grape-like sacs at end of bronchioles, gas exchange |
| alveoli (part 2) | surrounded by network of capillaries |
| how we breathe (part 1) | air enters alveoli; oxygen goes through alveoli walls into capillaries |
| how we breathe (part 2) | oxygen carried by blood to cells; CO2 return through capillaries to alveoli |
| how we breathe (part 3) | carbon dioxide (CO2) in alveoli exhaled |
| diaphram | dome-shaped muscle that helps breathing |
| how inhaling works (part 1) | diaphram contracts/flattens (pulls down) chest expands |
| how inhaling works (part 2) | decrease air pressure in lungs, air rushes in lungs |
| how exhaling works (part 1) | diaphragm relaxes, normal position pushes air out |
| how exhaling works (part 2) | increased air pressure in lungs forces air out, lungs smaller |
