Specialized cells are organized
together with other cells. There are
several levels of organization:
Tissues:
The epithelial tissue is made
up of cells that form surfaces
over other organs.
The connective tissue supports
and holds together other tissues
in the body.
Muscle tissue can contract
and become shorter and
fatter
Nerve tissues send electrixcal
tissues around the body
Organ:
Organs are tissues grouped together
to make organs. There are many
different types of organs such as:
Heart
Liver
Kidney
Skin
Organ systems
Organs in your body don't work alone.
They are organized so they can work
together to complete a task.. Examples are:
The skeletal system which is
your skeleton and muscles
The excretory system
that gets rid of wastes
The nervous system that
sends messages around
your body
The respiratory system
that gets oxygen for you
and releases carbon dioxide
The reproduction system that creates
and transports specialized cells needed
for reproduction
Plants tissue and organs
Plants have fewer organs and organ system
than animals. They are mostly organized at the
tissue level and not organs.
Vascular tissues are used to
transport materials around the
plant. They consist of 2 type of cells:
Xylem are thin tubes with
strong walls that transfer
water from the roots
Phloem carries glucose from the
leaves to all the other parts of the
plant.
The main organs of plant are the
roots, stem and leaves
The root takes water into the plant
from the soil
The stem holds the leaves of the plant to
the sun. It also carries water from the
roots to the leaves and transports glucose
to all the parts of the plant
The leaves are the organs that
carry out photosynthesis