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Tables based on a heliocentric model of the universe which used elliptical orbits for the planets were more accurate than ____________________.
T-cells
A type of white blood cell that plays a central role in cell-mediated immunity, recognizing and destroying infected cells in the body.
Maturation
The process of development and growth, leading to a fully developed or mature state.
Complement Proteins
Proteins in the blood that help or "complement" the immune system in destroying pathogens.
Plasma Membrane
The biological membrane that separates the interior of all cells from the outside environment, controlling the movement of substances in and out of cells.
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