blood and immunity (c+p fr physiology) Flashcards
3 functions of Immunity
1 recognize/remove abnormal self cells
2 removal of dead/damaged cells
3 protects body fr disease-causing pathogens
3 functions of Immunity
1 recognize/remove abnormal self cells
2 removal of dead/damaged cells
3 protects body fr disease-causing pathogens
2 Primary Lymphoid Tissues
sites where immunity cells form + mature
1 Thymus Gland
2 Bone Marrow
Secondary Lymphoid Tissues
1 Encapsulated Lymphoid Tissues (spleen + lymph nodes)
2 Unencapsulated Diffuse Lymphoid Tissues [skin, MALT (mucosa-associated lymphoid tissues), GALT (gut-associated lymphoid tissue)]
Leukocytes
- primary immune cells
Phagocytic Leukocytes
1 Neutrophils (primary phagocyte) 2 Macrophages (primary phagocyte) 3 Dendritic Cells (link innate + adaptive immunity)
Antigen-Presenting Cells (APCs)
phagocytic cells that return digested antigen peptide to APC membrane combined w MHC class II
- macrophage + dendritic cell
- dendrites w antigen migrates to lymphoid tissues to present the antigen to lymphocytes
Antigen-Presenting Cells
1 macrophages
2 dendritic cells
Basophils
Mast Cells in tissues
-release chem that contribute to inflammation + innate immune response
Mast Cells are concentrated in connective tissues of lungs, skin, GI tract)
Eosinophil
- found in GI tract, lungs, urinary/genital epithelia, + connective tissue of skin
- attach to large antibody-coated parasites and release their granules into them
- allergic rxn - inflammation + tissue damage
Neutrophil
- phagocytic cells that ingest + kill 5-20 bacterias, release cytokines, chem mediators in inflammatory response
- short lifespan of 1-2 days
- most abundant (50-70% of WBC)
Monocytes
- monocytes are precursor to macrophages
- spend only 8 hrs in circulation to move fr bone marrow to target tissue
- in tissue, they enlarge + differentiate into Macrophage
Macrophage
- phagocytic; primary scavengers
- some patrol, some fixed
- larger/more effective than neutrophil (ingest up to 100 bacteria)
Lymphocyte
- 20-30% of WBC=5%of all lymphocytes
- 95% are found in lymphoid tissues
- secretes CYTOKINES that targets immune + non-immune cells, + sometimes pathogens
2 Primary Lymphoid Tissues
sites where immunity cells form + mature
1 Thymus Gland
2 Bone Marrow
Secondary Lymphoid Tissues
1 Encapsulated Lymphoid Tissues (spleen + lymph nodes)
2 Unencapsulated Diffuse Lymphoid Tissues [skin, MALT (mucosa-associated lymphoid tissues), GALT (gut-associated lymphoid tissue)]
Leukocytes
- primary immune cells
6 Types of Leukocytes
never let monkeys eat bananas, Dummy
1 Neutrophil 2 Lymphocytes 3 Monocytes (turns into Macrophage) 4 Eosinophils 5 Basophils 6 Dendritic Cells
Phagocytic Leukocytes
1 Neutrophils
2 Macrophages
3 Dendritic Cells
Antigen-Presenting Cells
1 macrophages
2 dendritic cells
Molecules of Innate Immune Response
Chemotaxins (signal moles that attract leukocytes to help)
Opsonins (moles that coat foreign particles to make them visible to phagocytes)
Pyrogens (raise body temp by altering hypothalamic setpoint)
Acute-Phase Proteins (increased concentration of various plasma proteins during the acute/early phase)
Eosinophil
- found in GI tract, lungs, urinary/genital epithelia, + connective tissue of skin
- attach to large antibody-coated parasites and release their granules into them
- allergic rxn - inflammation + tissue damage
Neutrophil
- checytic cells that ingest + kill 5-20 bacterias, release cytokines, chem mediators in inflammatory response
- short lifespan of 1-2 days
- most abundant (50-70% of WBC)
Monocytes
- monocytes are precursor to macrophages
- spend only 8 hrs in circulation to move fr bone marrow to target tissue
- in tissue, they enlarge + differentiate into Macrophage
Macrophage
- phagocytic; primary scavengers
- some patrol, some fixed
- larger/more effective than neutrophil (ingest up to 100 bacteria)
Molecules of Adaptive Immune Response
1 Major Histocompatibility Complex (MHC)
2 Antibodies
3 T-cell Receptors
Major Histocompatibility Complex (MHC)
- family of membrane protein complexes encoded by a specific set of genes
- proteins combine w peptide fragments of antigens that have been digested w/in the cell; MHC antigen-complex then binds to the surface of the cell so that the antigen is visible. MHC antigen-complex binds w/ T cell immune receptor
- 2 classes
T + B lymphocytes
Maturation
Both are from the bone marrow. T goes to the thymus to mature.
B stays in the bone marrow; can mature to Plasma Cells
MHC class II molecules
found promarily on antigen-presenting cells
Antonym for Antibodies
Immunoglobulins
globular proteins that participate in adaptive immune responses
Clone
group of lymphocytes that bind to that particular antigen.
Each B + T lymphocytes binds only to 1 particular antigen. If a pathogen appears, the clone who’s cell receptor match the pathogen quickly reproduces to provide the additional cells
Self-Tolerance
the lack of immune response by lymphocytes to the cells of the body so that the individual is not harmed
prevents autoimmune response
Hygiene Hypothesis
challenging the immune system early in life streghtens it
Acute-Phase Proteins
- increased concentrations of various plasma proteins durint the acute phase (early phase)
- normaly declines to normal as immune phases proceeds
- acts as opsonins (coats particles for phagocytes to see), enzyme inhibitors (to prevent tissue damage), and C-reactive proteins (CRP)
C-reactive Proteins (CRP)
acute-phase protein
Histamine
- found in granules of Mast Cells/Basophils
- initiates inflammatory response
- brings more leukocytes to injury site by dilating blood vessels to the area + opening pores on capillaries (more proteins leak into interstitial space, water follows, results w swelling)
Membrane Attack Complex
group of lipi-solulable proteins
-inserts themselves into cell membranes of pathogens/virus-infected cells; forms giant pores, allows water + ions to flow in; cell/pathogen swell, and lyse
Molecules of Adaptive Immune Response
1 Major Histocompatibility Complex (MHC)
2 Antibodies
3 T-cell Receptors