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The alveoli are highly folded in order to increase the surface area available for gas exchange. The thins walls of the alveoli and the supplying capillaries allow for a short diffusion distance, thus incr...
Both mitosis and meiosis are processes of dividing a diploid cell, however there are a number of key differences. Mitosis results in two genetically identical, diploid, daughter cells and takes place duri...
Physical barriers:
skin to prevent entry of organisms into the bloodstream
cilia lining the nasal passages / bronchi to prevent entry to lungs / remove mucus
Homeostasis
Oxygen and carbon dioxide, dissolved in water, are exchanged by diffusion in the lungs. Blood travelling to the lungs is deoxygenated and instead of oxygen, carbon dioxide is bound to the red blood cells....
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