This 1930s educational film provides a detailed exploration of the respiratory and excretory ... The film transitions to the excretory system, showcasing kidneys, ureters, the bladder, and the ...

Parts of the model represent different parts of the respiratory system as shown here. The model, which is air tight, represents the thorax, and air is only able to enter via the glass tube which ...

Transitioning to human biology, the film explores blood circulation, the respiratory system, and the mechanics of vision. Detailed animations illustrate the function of the optic nerve ...

Respiration by living organisms can be investigated by carrying out experiments to show the production of carbon dioxide and heat. Limewater can be used to detect carbon dioxide. Breathing in ...