Fill in the blanks with the words given below. Change the form where necessary. 

characteristic     concentration    distribution   ethical     principal    toxicology

1.Cells differ widely in form and function but they all have certain common ________.

2.The _________ types of tissue are epithelial, connective, nervous, and muscular.

3.These factors, coupled with dosage, determine the ______ of a drug at its sites of action.

4.Pharmacokinetics deals with the absorption,__________, biotransformation, and excretion of drugs.

5. ________ is the aspect of pharmacology that deals with the adverse effects of drugs.

6.The pharmacological evaluation of drugs in man may be limited for technical, legal, and ________ reasons.