| Insulin and glucagon are ____ that regulate blood glucose. |
amino acids |
| Blood travels from your heart to your legs through ____. |
arteries |
| Human cells organize into ____ and then into organs. |
bronchi |
| The brain, heart, stomach, and lungs are examples of ____. |
hormones |
| The various pigments that give skin and hair color are ____. |
melanins |
| The trachea divides into two main ____ that lead to the lungs. |
organs |
| Proteins are polymers (chains) of ____. |
tissues |
| Blood travels from your legs to your heart through ____. |
veins |
