๐Ÿ˜ค Gas exchange in mammals and plants

In complex, multicellular organisms cells organise themselves in such a way that enables a greater structure and function. Cells differentiate into specific structures and functions, and organise themselves as such into tissues. The different tissues can then form organs with yet a higher level of structure and function, and organs can work together in certain broad areas of the organismโ€™s structure and function by taking part in organ systems.

 

 

Isnโ€™t that grand? Let me tell you a little secret. For anyone whoโ€™s seen the film Life starring our first Martian life form called Calvin, there is way that cells can associate the way Calvin does. In this case, cells arenโ€™t at all differentiated to do different things in tissues, organs, etc. but instead maintain their single cell status among equal single cells. They associate at a higher level to produce certain greater effects, and can even look as if the structure were multicellular or complex, but it isnโ€™t really, or at least it isnโ€™t in the same way it is for true multicellular organisms.

 

This is the case for algae as well as for…