Transcript The Cell - Junction Hill C

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.
• There are cells that only
function when part of a
larger organism, such as
the cells that make up your
body.
• The onecelled
organism
amoeba
proteus
A singlecelled
bacteria
of the
type:
E. coli
• A plant
cell from
the leaf
of a
poplar
tree
A human
red blood
cell
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.
Staphylococcus aureus
Cell
division in
this
bacteria
can occur
every 20
to 30
minutes.
Leukemia Cell
This
leukemia
cell is
tearing
itself apart
Fibrin Clot with Red Cells
• Platelets
released from
the circulation
and exposed to
the air use
fibrinogen from
the blood
plasma to spin
a mesh of fibrin
Escherichia coli
• Escherichia coli
(E. coli ) are
very common
intestinal
inhabitants.
Some can be
dangerous in
food and water
supplies
Human Macrophage
• Human macrophage
ingesting
Streptococcus
pyogenes. The
spherical cell riding
piggy-back on the
macrophage is a
lymphocyte, an
important component
in the immune
response to infection
Human Red Blood Cells
• Red cells get
their red color
from iron-rich
hemoglobin
which is
responsible for
transporting
oxygen
throughout the
body
Human Neutrophil
• Human neutrophils
are white blood cells
that serve as
professional
phagocytes: their
primary function is to
eat and kill bacteria
and they arrive
quickly at the site of a
bacterial infection
Human Eosinophil
• Eosinophils
are
important in
combatting
parasitic
diseases
There are many
different types of
cells in the human
body. None of these
cells function well on
there own, they are
part of the larger
organism that is
called - you.
Tissues
• Cells group together in the body
to form tissues - a collection of
similar cells that group together
to perform a specialized
function.
• There are 4 primary tissue types
in the human body: epithelial
tissue, connective tissue, muscle
tissue and nerve tissue.
Epithelial tissue serve as membranes
lining organs and helping to keep the
body's organs separate, in place and
protected.
Some examples of epithelial tissue are:
outer layer of the skin
inside of the mouth
stomach
tissue surrounding the body's
organs.
Most types of connective tissue
contain fibrous strands of the
protein collagen that add
strength to connective tissue.
Some examples of connective
tissue include:
inner layers of skin, tendons,
ligaments, cartilage, bone and
fat tissue.
Muscle tissue is a specialized tissue
that can contract. Muscle tissue
contains the specialized proteins
actin and myosin that slide past
one another and allow
movement.
Examples of muscle tissue are
contained in the muscles
throughout your body
Nerve tissue has the ability to
generate and conduct electrical
signals in the body. These
electrical messages are
managed by nerve tissue in
the brain and transmitted
down the spinal cord to the
body
An organ is a structure that
contains at least two different
types of tissue functioning
together for a common
purpose. There are many
different organs in the body:
liver, kidneys, heart, even your
skin is an organ.
In fact, the skin is the largest organ
in the human body
• The skin is composed of three
layers: the epidermis, dermis and
subcutaneous layer.
• The epidermis consists of
epithelial tissue. Below the
epidermis lies a layer of
connective tissue called the
dermis.
• The dermis contains blood vessels
that nourish skin cells. It contains
nerve tissue that provides feeling
in the skin. And it contains muscle
tissue that is responsible for
giving you 'goosebumps' when
you get cold or frightened.
• The subcutaneous layer is beneath
the dermis and consists mainly of
a type of connective tissue called
adipose tissue. Adipose tissue is
more commonly known as fat
Organ systems are composed of
two or more different organs that
work together to provide a
common function.
There are 11 major organ systems
in the human body
• The main role
of the skeletal
system is to:
• provide
support for the
body
• protect delicate
internal organs
• provide
attachment
sites for the
organs.
The main role of the
muscular system is to
provide movement.
Muscles work in pairs to
move limbs and provide
the organism with
mobility.
Muscles also control the
movement of materials
through some organs,
such as the stomach and
intestine, and the heart
and circulatory system