3. During an emergency, the brain signals release of more oxygen and glucose (sugar) causing an increase in the heartbeat and rapid breathing.

4. When you accidentally touch a hot object, your muscles contract, causing your bones in the fingers to release the hot object.

5. Blood cells that carry oxygen are being produced in the bone marrow.

6. The skin produces Vitamin D and is used for absorption of calcium in bones.

7. The muscles contract to release unwanted substances that enter the windpipe.​