Cells are the basic unit of life that perform three major functions - regulation, reproduction, and excretion. Regulation controls a living thing's activities through nervous and endocrine systems. Reproduction allows living things to produce offspring through asexual or sexual means. Excretion removes waste from cells. These functions performed by cells are vital for the life of the organism.

2. Cells are the basic unit of life.
Humans are multi-celled complex
organisms that require each part
to work together. Every organ
and system of the body depends
on each cell to perform three
major functions. These functions
are vital to the life of the cell and
the life of the organism

3.  REGULATION
 the process where a living thing
controls and coordinates its
various activities.
in animals
 nervous system uses nerve cells
 endocrine system uses hormones
in plants

5.  REPRODUCTION
 the process by which living things
produce new living things of the
same kind
 asexual reproduction--involves one
parent and the offspring are
identical to the parent
 sexual reproduction--involves two
parents and the offspring is a
combination of both parents

7. EXCRETION
the process by which living
things remove waste
products produced by cell
activities

9. GROWTH
the process by which living
things increase in size or cell
number

11.  NUTRITION
 the process by which living things
take in materials from its
environment for growth and repair
 autotrophic nutrition--where a
living thing can make its own food
 heterotrophic nutrition--where a
living thing must ingest (take in) its
food

13.  TRANSPORT
 the process by which usable
materials are taken into the
living thing (ABSORPTION) and
distributed throughout the
living thing (CIRCULATION)

15.  SYNTHESIS
 the process by which smaller,
simple substances are combined
chemically to form larger, more
complex substances

17.  MOTILITY
 can refer to movement of some
components of the cell or to the
movement of the whole cell
 Prokaryotic cells move by rotating
a rigid flagellum. Eukaryotic cells
e.g. plant cells and animal cells move
via the actions of flexiblecilia or
flagella

19.  IRRATIBILITY
 Sensing and responding to
changes in the sorroundings

21.  RESPIRATION
 the breakdown of nutrients to
yield (or give off) chemical energy
 aerobic respiration- uses oxygen
 anaerobic respiration- doesn't use
oxygen

22.  METABOLISM--the total of all the
life functions required to sustain
life (to stay alive)
 HOMEOSTASIS--
the process by which an organism's
metabolic activities are in a state of
balance
ex. body temp, blood sugar levels