These three features are particularly important to our lungs for efficient gas exchange. Most of them also apply to other exchange surfaces such as the small intestine, body tissues and placenta.

Throughout evolution, plants have continuously adapted to survive in changing environments. Apart from complex structural ...

Spongy mesophyll close spongy mesophyllThe plant tissue in a leaf which has loosely packed cells and air spaces between them to allow gas exchange. tissue is packed loosely for efficient gas exchange.