The specialists who diagnose and treat immune system disorders are called immunologists and the specialty itself is called immunology Phagocytes Phagocytes are often the first immune system cells ID: 779616
Download The PPT/PDF document "The Immune System The immune system enab..." is the property of its rightful owner. Permission is granted to download and print the materials on this web site for personal, non-commercial use only, and to display it on your personal computer provided you do not modify the materials and that you retain all copyright notices contained in the materials. By downloading content from our website, you accept the terms of this agreement.
Slide1
The Immune System
Slide2The immune system enables the human body to remove many kinds of assaults.
The specialists who diagnose and treat immune system disorders are called
immunologists
, and the specialty itself is called
immunology
.
Slide3Slide4Phagocytes
Phagocytes are often the first immune system cells
when
injury occurs. They prevent infection by cleaning away pathogens.
Two types of phagocytes are microphages and macrophages.
Microphages, which constantly circulate in the bloodstream, are more plentiful than macrophages but are short-lived. Macrophages live longer than microphages, and they reside in critical areas, such as the pleural and abdominal cavities, as first-response defenders.
Slide5Lymphocytes
When leukocytes (white blood cells) in the bloodstream are needed to fight infection, they leave the blood and enter the lymphatic system; they are then called lymphocytes. They include three different types:
NK cells, T cells,
and
B cells
.
Slide6NK Cells
NK (natural killer) cells travel throughout the body. Natural killer cells can combat viral infection and malignant cells.
Slide7T Cells
They depend on the thymus for activation.
B Cells
B cells are derived from bone marrow.
Slide8The Lymphatic System
The lymphatic system comprises the vessels through which lymphocytes travel
Lymph
Like blood plasma, lymph is a fluid that consists
mostly of water. It also contains a low
concentration of proteins in solution and lymphocytes.
Slide9Lymph Vessels
Lymph vessels also called lymph ducts. The largest of the lymph vessels are the thoracic duct and the right lymphatic duct.
Slide10The Thymus
The thymus gland, located behind
the sternum, secretes hormones,
known collectively as
thymosin
,
which help T cells develop. The
thymus is most active in children
and gradually and continuously
loses some of its function with
maturation and further aging.
Slide11The Spleen
The
spleen, which contains phagocytes, removes damaged red blood cells
Slide12Lymph Nodes
Lymph nodes are structures of variable size that contain macrophages that filter out disease-causing antigens.
Slide13Tonsils
Any collection of lymph tissue can be called a tonsil. The palatine, pharyngeal, and lingual tonsils.
Slide14Term
Defintion
autoimmunity
immune responses against person own healthy cells and tissues
antigen
substance that induces sensitivity or an immune response in the form of antibodies
antibody
a molecule generated in specific opposition to an antigen
immunodeficiency
impairment of the immune system
Slide15phagocytosis
process of white blood cells clearing
away
pathogens
toxin
a poisonous substance