Engineering Explorations 7/10: Mini Lungs
Today, in Engineering Explorations, the students learned about the anatomy of the heart and lungs and how they function in the human body. Our bio-engineers built their own working model of a lung and demonstrated how the diaphragm works based on air pressure differentials. The end goal of the day was to relate the lung model to relevant heart anatomy and physiology.
Ask your student: What is the purpose of the diaphragm in the respiratory system? (Each breath begins with a contraction of a dome-shaped sheet of muscle underneath the lungs called the diaphragm. During inhalation (taking air into your lungs) your diaphragm contracts, or flattens downward, which reduces pressure in the chest cavity. Normal outside air pressure is higher, which forces air through the nose and mouth, down the trachea and into the lungs where pressure is lower (pressure systems move from high to low). On the other hand, upon exhalation your diaphragm relaxes, which increases pressure on the lungs and forcing air, containing carbon dioxide, out of the body.)