external boundary,

confines cell contents; regulates entry and exit of materials

cytoplasm

site of intracellular digestion

scattered through cell;

control release of energy from food; form ATP

projections of the plasma membrane

increase the membrane surface area

near nucleus in cytoplasm

packages, modifies, and segregates proteins

middle of cell

directs cell function

two rod-shaped bodies near the nucleus

direct formation of the mitotic spindle

center of nucleus

site of ribosomes

cytoplasm

site of lipid and steroid synthesis, lipid metabolism, and drug detoxification

cytoplasm

synthesizes phospholips and cholesterol; makes proteins

attatched to the membrane systems or scattered in the cytoplasm,

synthesize proteins

nucleus

constitutes the genes (DNA)

Proxisomes

scattered in cytoplasm

detoxify alcohol, hydrogen peroxide, etc.

cytoplasm

nutrients, cell waste, stores item