Cells are the basic building blocks of all animals
and plants. They are so small, you need to use a
light microscope to see them.
Humans are multicellular. The cells
in many multicellular animals and plants are
specialised, so that they can share out the
processes of life. They work together
to support the different processes in an
organism.
Multicellular organisms are organised
into increasingly complex parts. In order,
from least complex to most complex:
cells, tissues, organs, organ systems,
organism
circulatory system respiratory
system digestive system
nervous system reproductive
system
Examples of tissues are, muscle,
the lining of the intestine, the lining
of the lungs, xylem (tubes that
carry water in a plant)
CELLS MAKE---> TISSUES WHICH MAKE --> ORGANS
Tissues
Animal cells and plant cells can form
tissues, such as muscle tissue in animals. A
living tissue is made from a group of cells
with a similar structure and function, which
all work together to do a particular job.
Organs
A group of tissues that perform a specific
function or group of functions.
Some organs are the liver,
heart, brain, kidney,
stomach...