Finally, lets look at the excretion of toxicants within the body:

1. Which type of chemical is easier for the body to eliminate a hydrophilic molecule or hydrdophobic (or lipophilic)? Why?

2. Chemicals must pass through membranes in order to leave the body.

3. What chemical and physical properties govern this passage?

4. What are the chemical and physical properties for molecules that are excreted through urinary excretion?