| A | B |
|---|
| brain | The mass of nerve tissue that is the main control center of the nervous system |
| heart | A hollow, muscular organ that pumps blood throughout the body. |
| spinal cord | Nerves that run up and down the length of the back and transmit most messages between the body and brain |
| bronchial tubes (bronchi) | two tubes that branch off the trachea to carry air to the lungs |
| lymph nodes and spleen | serve as reservoirs of white blood cells and filters for lymph, removing antigen-presenting cells and foreign matter and activating the immune system when necessary |
| glands | release hormones into the blood stream; hypothalamus, pituitary, thyroid, parathyroid, adrenal, pineal |
| fallopian tubes, ovaries, and uterus | organs of the female reproductive system; responsible for releasing an egg and growing a baby |
| testes and prostate gland | organs of the male reproductive system; responsible for releasing sperm |
| smooth muscle | Involuntary muscle found inside many internal organs of the body |
| skeletal muscle | A muscle that is attached to the bones of the skeleton and provides the force that moves the bones. These are voluntary. |
| cardiac muscle | Involuntary muscle tissue found only in the heart. |
| Cartilage | A connective tissue that is more flexible than bone and that protects the ends of bones and keeps them from rubbing together. |
| small intestine | Digestive organ where most chemical digestion and absorption of food takes place |
| large intestine (colon) | Absorbs water, vitamins and minerals from gut content; then passes on useless waste from the body |
| liver | produces bile to break down fats and filters toxins from the blood |
| Pancreas | An organ in the abdominal cavity with two roles. First is to produce digestive enzymes Second is to secrete insulin to help regulate blood glucose levels. |
| Gallbladder | stores bile |
| Bladder | Elastic, hollow, muscular organ that provides temporary storage for urine. |
| ureters | carry urine from kidneys to bladder |
| Urethra | tube leading from the urinary bladder to the outside of the body |
