Lab Exam 3 Study Guide Flashcards
What does PMN stand for?
polymorphnuclear neutrophils (PMN)
Name the WBC type, percentage and main purpose:
Monocytes, 3-8% of all WBC. Purpose: Phagocytosis (after transforming into fixed or wandering macrophages)
Name the WBC type, percentage and main purpose:
Lymphocytes. 20-25% of WBCs.
Name the WBC type, percentage, and main purpose:
Neutrophils. 60-70% of WBCs.
Phagocytosis. Destruction of bacteria with lysozyme, defensins, and strong oxidants, such as superoxide anion, hydrogen peroxide, and hypochlorite anion.
Name the WBC type, percentage, and main purpose:
Eosinophils. 2-4% of WBCs. Defense against parasitic infections.
Name the WBC type, percentage, and main purpose:
Basophils. 0.5-1% of WBCs. Liberate heparin, histamine, and serotonin in allergic reactions that intensify the overall inflammatory response
What is the name for differentiated B lymphocytes?
Plasma cells
What is the name for differentiated monocytes when they migrate into the
tissues?
macrophages
What are the two primary lymphatic organs?
contain stem cells that produce lymphocytes and are the site where these lymphocytes become immunocompetent:
red bone marrow and the thymus
What are the secondary lymphatic organs and tissues?
Sites for defense against invading agents and cancer cells:
lymph nodes, spleen, and lymphatic nodules.
What are the names of the two main lymphatic ducts?
Right lymphatic duct and thoracic duct (left lymphatic duct)
Where do these lymphatic ducts drain into the venous blood
subclavian vein
Where are the 3 main clusters of lymph nodes?
Inguinal (groin), axillary (armpit) and cervical (neck)regions.
There are clusters elsewhere, such as abdominal, popliteal & aurical areas.
Know the following components of a lymph node and what types of cells of tissue make up each:
Capsule
External fibrous capsule – thin layer of dense fibrous connective tissue
Trabeculae extend inward and divide the node into compartments
Know the following components of a lymph node and what types of cells or tissue make up each:
afferent lymphatic vessels, efferent lymphatic vessels.
Do these vessels have valves? Why?
Endothelial cells – Afferent lymphatic vessels transport lymph into the lymph node. Efferent lymphatic vessels transport lymph away from the lymph node.
These vessels have valves to prevent backflow.
Know the following components of a lymph node and what types of cells or tissue make up each:
Trabeculae
extensions of the capsule that compartmentalize the lymph node. Fibrous connective tissue.
Know the following components of a lymph node and what types of cells or tissue make up each:
subcapsular sinus, trabecular sinus, medullary sinus.
Know the route of flow of lymph through a lymph node.
The sinuses of the lymph node are located in the cortex and the medulla and are separated by the trabeculae and medullary cords respectively
Lymph enters each node through the afferent vessels and travels through the subscapular sinus, trabecular sinuses, and medullary sinueses and exits the node via efferent vessels.
Know the following components of a lymph node and what types of cells or tissue make up each:
Outer cortex, germinal centers, inner cortex, medulla.
Lymph node is composted of reticular tissue. The cortex is the superficial region and the medulla is the deep region.
The cortex of a lymph node contains many lymph follicles (dendritic cells surrounding germinal centers) which are separated by connective tissue trabeculae and the cortex contains a branching system of channels which route lymph from the afferent lymphatic vessels to the medulla; antigen-presenting macrophages and T and B lymphocytes in the cortex are involved in immune reactions to specific antigens.
The medulla of a lymph node contains medullary cords (thin inward extensions of cortical lymphoid tissue) and lymph sinuses spanned by crisscrossing reticular fibers which act as a filter for the passage of lymph from the cortex to the efferent lymphatic vessels which carry lymph away from the lymph node at the hilus; the medulla also contains many macrophages.
germinal center - The light-staining interior of a lymph follicle which contains a few dendritic cells, some antigen-presenting macrophages and many activated proliferating T and B lymphocytes, particularly B lymphocytes, which are involved in immune reactions to specific antigens.
What are reticular fibers? What is their role in the lymph node?
reticular fibers form a network that supports other cell types in lymphoid organs and tissues.
Reticular fiber is connective tissue composed of type III collagen secreted by reticular cells. Reticular fibers crosslink to form a fine meshwork (reticulin). This network acts as a supporting mesh in soft tissues.
What is present in red pulp in the spleen? What is
present in white pulp? What are the connective tissue components?
Red pulp: stores platelets and contains reticular fibers that cannot be seen at this magnification.
White pulp: resembles nodules with many lymphocytes and macrophages and appears dark purple when stained.
Contains reticular connective tissue and encapsulated by fibrous connective tissue.
Define the terms: immunogenicity, antigen, antibody
immunogenicity: the ability to provoke an immune response
antigen: A substance that has immunogenicity and reactivity (the ability to react with antibodies or cells that result from an immune response)
antibody: a protein produced by plasma cells in response to specific antigen. The antibody combines with that antigen to neutralize, inhibit, or destroy it. Antibodies are sometimes called immunoglobulins. Since antibodies circulate in the serum, they are often called anti-(X) serum e.g. anti Rh serum would be an antibody that binds to Rh facotr
Define the terms: agglutinogen, agglutinin, agglutination, hemolysis.
agglutinogen: antigens found on the surface of erythrocytes (red blood cells)
agglutinin: an agglutinin is a substance that causes particles to coagulate to form a thickened mass
agglutination: clumping of RBCs
hemolysis: rupture of RBCs
Know what type of agglutinogens and what type of agglutinins are present in types A, B, AB, O and Rh+ blood.
Type A blood: anti-B antibodies (B is an agglutinin), A antigens (agglutinogens)
Type B blood: Anti-A antibodies (A is an agglutinin), B antigens (agglutinogens)
Type O Blood: Anti-A and Anti-B antibodies (A and B are agglutinins), neither A nor B antigens (agglutinogens) (universal donor)
Type AB blood: neither Anti-A nor Anti-B antibodies (neither are agglutinins), both A and B antigens (agglutinogens) (universal recipient)
Rh+ blood: have Rh antigen (agglutinogens)
Why do you need to match blood types for transfusions?
To avoid immune response to foreign antigens resulting in clumping of blood.