| A | B |
| Cells | The major building blocks of life |
| Tissue | A group of cells of the same type |
| Organs | Tissues of different kinds that do special jobs |
| Cardiac Muscle | Heart |
| Smooth Muscles | Stomach, intestines, blood vessels and bladder |
| Striated Muscles | Skeletal muscles that have light and dark stripes |
| Lungs | Main organ of the respiratory system |
| Neurons | Cells that form nerves |
| Esophagus | Connects mouth to stomach |
| Large intestine | Removes water from food |
| Small intestine | Where digestive juices are added |
| Brain | Control center of the nervous system |
| Spinal cord | A tube of nerves that runs though your spine |
| Nerve | Group of neurons that pass along information |
| Arteries | Carry blood away from the heart |
| Veins | Blood vessels that return blood to the heart |
| Capillaries | Provide a way for gases, nutrients,and wastes to pass between the blood and cells |