The Immune Systems
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Transcript The Immune Systems
The Immune System
Lesson 1:
The Immune Systems
Lesson Objectives
Upon completion of this lesson, students should
be able to …
Identify and discuss the anatomy of the
immune system.
Discuss the functions of the immune system.
Explain the immune system and its response.
Composition of the Immune
System
Tissues
Organs
Physiological processes that identify abnormal cells
Foreign substances
Foreign tissues, such as transplants
Structures Central to the
Immune System
Central lymphoid tissue
bone marrow, thymus
Peripheral lymphoid tissue
lymph nodes, spleen, and mucus
membranes
Critical Thinking Questions
1.
What is so critical about the immune system to one’s
overall health?
2.
If one has a compromised immune system would
that shorten the person’s life?
The Immune System
throughout the body
part of the lymphatic system
subsystem of the CV system
Primary fx is to defend against invasion
Pathogens (viruses, bacteria, and fungi)
Immunosuppressants, medications, and stress can
suppress system
The Lymphatic System
Watch This
http://www.cbsnews.com/video/watch/?id=6944753n
Bone Marrow
Contains stem cells that create all the cells
Produces
RBC’s
WBC’s
Platelets
B cells
Natural killer cells
Thymus Gland
Located posterior to the sternum
Manufactures infection-fighting T cells
Helps distinguish normal T cells from those that attack
the body
Enlarges during childhood
Shrinks as we age
Peripheral Lymphatic System
Consists of the lymph nodes, spleen, and
other lymphoid tissue
Lymph Nodes
Different sizes and
shapes
Most are bean-shaped,
about 1 inch long
Covered with a thick
fibrous capsule
Two Parts of Lymph Nodes
Cortex
Populated mainly with lymphocytes
Medulla
Primarily made up of macrophages
B Lymphocytes
Responsible for circulating antibodies
When an antigen enters the body,
B lymphocytes rapidly undergo mitosis and divide
This produces a large quantity of an antibody
Spleen
Located in the ULQ of the abdomen
Lots of blood vessels
Spleen’s blood vessels are lined with macrophages
swallow and digest debris in the blood
worn-out red blood cells and platelets
Tonsils
Located in the
depressions
of the throat and the
pharynx
Fx -filter bacteria
aid in the formation of
white blood cells
Factoid:
Tonsils used to be
removed when infected.
Immune Troop Worksheet
http://vimeo.com/138062
The Immune System
Defense against infectious organisms and pathogenic
invaders
Immune response
cells, tissues, and organs work together to attack
pathogen
white blood cells (WBCs), seek out and destroy
harmful organisms
Phagocytes
Phagocytes
WBC that attacks the invading organism
most common are neutrophils, which fight off bacteria
Lymphocytes
Lymphocytes
WBC allows the body to remember previous
invading organisms
Originate in the bone marrow
If stays there, it matures into B cells
If moves to the thymus gland, they mature
into T cells
B and T Lymphocytes
B lymphocytes
Seek out invading organisms
and send defenses to attach onto them
T cells
Destroy the organisms that the B
lymphocytes have id
Antigen
Foreign substance that invades the body
When an antigen is detected, several types of cells
work together to recognize and respond to it
These cells trigger the B lymphocytes to produce
antibodies
This process is known as humoral immunity
Antibodies
Specialized proteins that lock onto specific antigens
Immunoglobulins
Antibodies are found in blood, tissue fluids, and many
secretions
B Cells of the Immune System
Once antibodies have been produced, they remain in
the body
If re-infected, the antibodies are already there to
neutralize it
antibodies can recognize an antigen and lock onto it,
but are not capable of destroying it.
That is the job of the T cells.
T Cells
destroys antigens which have been tagged by
antibodies
Immunity
The body’s ability to defend itself against
pathogens
3 Forms
Innate Immunity
Born with innate, or natural, immunity
Renders many of the viruses and bacteria
incapable of harming infant
Provided by :
Skin
Mucous membranes
Mother
Active Immunity
by infection or with a vaccine
Is permanent ??
Types of Active Immunity
Acquired active immunity
exposed to a live pathogen
develops the disease
and becomes immune (primary immune response)
Artificially acquired active immunity
induced by a vaccine (antigen)
stimulates a primary response against the antigen
without causing symptoms of the disease
Passive Immunity
“Borrowed” from another source and lasts for only a
short time
An inherited immunity to certain diseases
Medical Specialists
Allergist
Immunologist
Oncologist