This 1930s educational film provides a detailed exploration of the respiratory and excretory systems, combining live-action demonstrations, animations, and intertitles to illustrate human anatomy ...

When exercising, cells will need more oxygen and produce more carbon dioxide as a result of increased respiration. When blood reaches the lungs, a larger volume of air is needed to replace the ...

Respiratory system models are experimental systems that recreate aspects of human respiratory system development, function or disease. Animal models such as dog, rodent and pig can be used to ...

Gas exchange occurs in the alveoli which are found in the lungs. Many spongy mesophyll cells are in contact with the air spaces, providing a large surface area for gas exchange to happen. The ...