|Your trachea divides into two main ____ that lead to your lungs.
|Your two ____ take in oxygen and expel carbon dioxide.
|Blood travels from your legs to your heart through ____.
|Human cells organize into ____ and then into organs.
|The ____ are the two upper chambers of the heart.
|Biceps and triceps are upper arm ____.
|Bacteria or viruses that cause diseases are called ____.
|The reproduction of bacteria can be stopped by ____.