1. Oxygen enters the body through the nose or mouth, travels down the trachea, into the bronchi and bronchioles, and finally reaches the alveoli in the lungs where gas exchange occurs. Oxygen diffuses into the bloodstream, binds to hemoglobin in red blood cells, and is transported to tissues throughout the body.
2. When you contract your diaphragm (it moves downward), your chest cavity expands, creating negative pressure that draws air into the lungs (inhalation). When you relax your diaphragm (it moves upward), the chest cavity decreases in volume, increasing pressure and forcing air out of the lungs (exhalation).
3. Your lungs have so much surface area because they are composed of millions of tiny air sacs called alveoli. This vast surface area maximizes the efficiency of gas exchange between the air and the blood.
4. The right lung is bigger than the left lung because it has three lobes, while the left lung has only two lobes. This asymmetry accommodates the space taken up by the heart, which is located slightly to the left side of the chest cavity.
5. Hemoglobin is the molecule in red blood cells that binds to oxygen in the lungs and transports it to tissues throughout the body.
6. The energy stored in food molecules (like glucose) is released during cellular respiration, primarily in the mitochondria. This energy is used to produce ATP, the main energy currency of the cell.
7. The lungs are responsible for bringing oxygen into the body and removing carbon dioxide, a waste product of cellular respiration, from the body.
8. The purpose of mucus is to trap dust, pathogens, and other particles in the respiratory tract, preventing them from reaching the lungs. Cilia then move the mucus upward to be expelled or swallowed.
9. During cellular respiration, glucose and oxygen are consumed, and carbon dioxide, water, and energy (ATP) are produced.
10. All living cells in your body perform cellular respiration to generate energy for their functions.
11. In cellular respiration: Food + Oxygen → Carbon Dioxide + Water + Energy (ATP)
12. An infant who is born too early may not have fully developed lungs, meaning they lack sufficient surfactant. Surfactant reduces surface tension in the alveoli, preventing them from collapsing after exhalation. Without enough surfactant, the alveoli collapse, making it extremely difficult for the infant to breathe and get oxygen into the bloodstream.
Parent Tip: Review the logic above to help your child master the concept of bill nye atmosphere worksheet.
