Fill in the blank or blanks with the correct answer.

1		There are systems in the human body. (This question requires a numeric answer.)
2		The study of structure is .
3		The tendency to maintain a constant internal environment is called .
4		A person lying face down in the anatomic position is in the position.
5		The system transports blood.
6		Superior is to above as is to in front of.
7		refers to near the origin of a limb.
8		is needed by cells to convert food into usable energy.
9		The smallest stable level of organization is the .
10		The system controls activities requiring immediate responses.
11		The structure that acts to respond to a stimulus is the
12		The ability to sense change in the external environment and modify bodily activity because of this change is a property called .
13		Proteins are categorized as in the levels of organization.
14		Manus refers to the .
15		All cells come from previous cells through .