These openings provide passageways for spinal nerves that proceed between joining vertebrae and connect to the spinal cord. The human female is physically capable of producing as many as thirty five children in her lifetime. Did you know that the average person will breathe about seventy five million gallons of air in a lifetime. About every seven years, your body replaces the equivalent of an entirely new skeleton. The cardiovascular system includes the heart and the blood vessels, and the respiratory system contains those organs which are responsible for carrying oxygen from the air to the blood stream and expelling the waste product of carbon dioxide.
Blood is that sticky, red fluid that circulates throughout our bodies in veins and arteries.
The heart pumps oxygen into the blood and collects carbon dioxide from it to be expelled through the lungs. We usually think of respiration as the process of the lungs after air is breathed in through the mouth or nose. The lungs do play a very important role, but every living cell in the body is involved in this process. Respiration is the act of burning energy from oxygen. Breathing is an obvious part of the respiratory passages, but these also involve yawning, sneezing, coughing, hiccups, the power of speech, and the sense of smell.