Re: What materials enter and which wastes leave the cell membrane?

Dear Matt,


It really depends on where the cell is located,ie in which tissue and 
organ.
Generally, metabolites like simple sugars (Glucose, fructose, galactose), 
essential and non-essential amino acids and fatty acids are needed by the 
cell for metabolism & synthesis of biological compounds. Lipophilic 
compounds diffuse through the membrane. Large, polar uncharged compounds 
enter the cell membrane using tranporter or channel. Ions such as calcium, 
sodium and phosphate enter the cell by specific energy-dependent 
transporters. 

Water and Oxygen are much needed materials for cell survival. Their entry 
is through simple diffusion.

Molecules like urea and carbon dioxide leave the cell as waste products.
It really depends on what cell you are refering to know what are the waste 
products.



Reference:

Biochemistry by Donald Voet and J.Voet