Physical

Chapter 1
HUS 122:
PHYSIOLOGY
THE CELL

,The Cell
 The cell is one of the most basic units of
life.
 There are millions of different types of cells.
 There are cells that are organisms onto
themselves, such as microscopic amoeba
and bacteria cells.
 And there are cells that only function when
part of a larger organism, such as the cells
that make up your body.

, The cell is the smallest unit of life in our
bodies.
 In the body, there are brain cells, skin cells,
liver cells, stomach cells, and the list goes on.
 All of these cells have unique functions and
features.
 And all have some recognizable similarities.
 All cells have a 'skin', called the plasma
membrane, protecting it from the outside
environment.

,  The cell membrane regulates the movement of water,
nutrients and wastes into and out of the cell.
 Inside of the cell membrane are the working parts of the
cell.
 At the centre of the cell is the cell nucleus.
 The cell nucleus contains the cell's DNA, the genetic
code that coordinates protein synthesis.
 In addition to the nucleus, there are many organelles
inside of the cell - small structures that help carry out the
day-to-day operations of the cell.
 One important cellular organelle is the ribosome.
 Ribosomes participate in protein synthesis.