Immune
and
Integumentary
Systems
Immune System
Functions
• The immune system defends
against disease.
• It recognizes, attacks, and destroys
foreign invaders such as bacteria
and viruses.
Organs
• Tonsils – lymph nodes in the throat
• Thymus – T-Cells made in the bone are
matured here.
• Lymph Nodes – small bean-shaped
masses
• Spleen – filters blood for foreign particles
carried by the white blood cells.
• Bone Marrow – makes white blood cells.
Immune System
Tonsils
Thymus
Lymph node
Spleen
Lymphatic vessel
Bone marrow
Tissues
• White Blood Cells – blood cells whose main function
is to defend the body against
disease.
• Lymphocytes – white blood cells.
o T-Cells – lymphocytes made in the bone marrow and
mature in the Thymus gland whose function is
to attack cells that have been invaded by viruses.
o B-Cells – lymphocytes made in the bone marrow that
make antibodies to attack viruses in the blood.
How It Works
1. Recognition – White Blood Cells identify
the antigens that do not belong in the
body. (viruses & bacteria)
2. Activation – White Blood Cells attach to
the foreign cells or viruses and destroy
them.
3. Disposal – foreign cells and viruses are
filtered out of the blood in the spleen.
Integumentary
System
(Skin)
Functions
•
•
•
•
•
•
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Regulates body temperature
Keeps germs out of the body
Senses temperature, texture, pressure, and pain.
Releases oil, waste and salt in sweat.
Shields body from UV rays
Produces vitamin D from UV rays.
Provides waterproof covering that prevents dehydration.
Specialized Cells
• Epidermis – outer layer of skin mostly
made up of dead cells.
• Dermis – functional layer of skin below
the epidermis.
How It Works
Epidermis
• Keratin – strong flexible protein that make
skin tough and waterproof.
• Melanin – pigment that gives skin its color
and shields the body from UV rays.
Dermis
• Contains – blood vessels, nerves, sweat glands,
oil glands, and hair follicles.
• Collagen – protein fibers that make skin flexible.