Human Body: Respiratory System (2nd Ed, 1980)

Film discusses that respiratory system is essential for life, facilitating the exchange of oxygen and carbon dioxide. Oxygen is obtained from the air, primarily produced by green plants through photosynthesis. Breathing involves the lungs and diaphragm, controlled by signals from the brain. Air enters through the nose and mouth, is warmed and moistened, and travels down the trachea to the lungs. Inside the lungs, oxygen diffuses into the bloodstream, where it binds to hemoglobin in red blood cells. Carbon dioxide, a waste product of cellular respiration, is transported back to the lungs to be exhaled. The respiratory system also regulates breathing rate based on carbon dioxide levels in the blood, and it plays a role in speech production.

**Keywords:** respiratory system, oxygen, carbon dioxide, breathing, lungs, diaphragm, photosynthesis, trachea, alveoli, hemoglobin, diffusion, cellular respiration, speech, regulation, blood.
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