Cell

Cell is the basic living structural and functional unit of the
body.

Cytology: - It is a branch of science concerned with a study of
cells

Cell Theory explains about
a) All living organisms are composed of cell and cell
products.
b) Cell is the basic unit of structure & function of all living
organisms.
c) All cells come from the division of pre existing cell.
d) An organism as a whole can be understood through the
collective activities & interactions of its cells.

To know more about cell, we can divide the cell in to four
principal parts: -

Plasma (cell) membrane: it is the outer lining, limiting
membrane separating the cell internal parts from extra cellular
materials & external environment.

Cytoplasm: cytoplasm is the substance that surrounds
organelles and is located between the nucleus and plasma
membrane Human Anatomy and Physiology
18
Organelles: these are permanent structures with characteristic
morphology that are highly specialized in specific cellular
activity.

Inclusions: they are the secretions and storage products of
cells.

Extra cellular materials are also referred to as the matrix,
which are substances external to the cell surface.