the antigens
a lymphocyte
Viruses are not made of cells.
A target cell is a cell in the body that recognizes a hormone's chemical structure. It is a cell to which a hormone binds chemically.
it helps keep the cell in shape.
cell wall
A fat cell is a round cell. The structure of the fat cell that helps the cell function is the shape allows the fat cell to accumulate a lot of lipids.
The Cell Wall The Cell Wall
The nucleues, the brain of the cell.
Flagellum.
it helps keep the cell in shape.
Hormone receptors on cell membranes recognize a hormone's chemical structure in the endocrine system. When the hormone binds to the receptor, a cell changes its behavior.
The cell membrane controls what substances go in and out of the cell. It is basically the most important structure when talking about homeostasis.