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Chapter 21 lymphatic immune system practice questions
Terms in this set (50)
Lymph originates in blood capillaries that pick up tissue fluid.
red bone marrow is the point of origin of all immune cells of the lymphatic system
Mucous membranes prevent most pathogens from entering the body because of the stickiness of the mucus and the presence of lysozymes.
interferons are secreted in response to bacterial infections
false secreted by nearby cells to tell nearby cells to make antiviral proteins
Pus is made of dead neutrophils, macrophages, and other tissue debris from a damaged tissue.
Pyrogens act by increasing the set point for body temperature in the thalamus.
The antigenicity of a molecule is due to specific regions of it called haptens.
Interleukins are chemical signals by which immune cells communicate with each other.
helper T cells respond only to epitopes attached to MHC proteins
Cytotoxic T cells respond only to antigens bound to MHC-I proteins.
clonal selection of T cells happens in the thymus
Naive T cells can synthesize antibodies
Humoral immunity takes care of intracellular viruses, whereas cellular immunity takes care of extracellular viruses.
false, other way around
Most Memory B cells are found circulating in the lymph.
Some antibodies against foreign antigens can react to similar self-antigens causing an autoimmune disease.
lymphatic vessels recover about .... of the fluid filtered by capillaries
Special lymphatic vessels called lacteals absorb dietary ______________ that are not absorbed by the blood capillaries.
The ______________ tonsils are the largest, and their surgical removal (tonsillectomy) used to be one of the most common surgical procedures performed in children.
palatine (FRONT OF MOUTH YOU CAN SEE THEM WHEREAS THE OTHER ONES YOU CANNOT)
which of the following forces does not help lymph to flow?
the lymphatic node pump
which of the following is not an example of lymphatic tissue
______________ are the largest of the lymphatic vessels, and they empty into the ______________.
collecting ducts, subclavian veins
Immune surveillance is a process in which ____________ nonspecifically detect and destroy foreign cells and diseased host cells.
natural killer (NK) cells
The only lymphatic organ(s) with afferent lymphatic vessels is(are) the ______________.
Lymph nodes (pushes the blood AWAY = afferent)
Removal of the______________will be the most harmful if all for a one year old child
thymus; makes hormones and as we age the thymus shrinks and houses developing lymphocytes... because t cells are trying to catch up and learn to recognize more pathogens that is why childrens thymus are so large
______________ lacks the capacity to remember a pathogen or react differently to it in the future, whereas ______________ utilizes memory cells to adapt to a given pathogen and ward it off more easily in the future.
innate immunity, adaptive immunity
(adaptive= to adapt)
(innate= cant adapt)
______________ employ a "respiratory burst" to produce bactericidal chemicals such as hydrogen peroxide (H_2O_2) and hypochlorite (HClO).
neutrophils(wander in connective tissue killing bacteria; first responder)
complement fixation cannot lead to
endogenous pyrexia (things on the inside cause a fever)
are secreted by cells infected with viruses, alerting neighboring cells and protecting them from becoming infected
The first of a series of neutrophil behaviors in inflammation is __________.
Basophils of the blood help to get defensive leukocytes to the site quickly by releasing an anticoagulant called ______________ and a vasodilator called ______________.`
heparin (inhibit clot formation and impede leukocyte mobility), histamine(increases blood flow and speeds delivery of leukocytes)
One group of proteolytic enzymes secreted by natural killer (NK) cells is __________.
Complement C3b protein coats bacteria and stimulates phagocytosis by ___________ in a process called _____________.
neutrophils and macrophages; opsonization(an immune process which uses opsonins to tag foreign pathogens for elimination by phagocytes)
Vaccination stimulates __________ immunity.
Cellular(cell-mediated) immunity is effective against
- cellular immunity: lymphocytes directly attack and destroy foreign cells of diseased host cells (intracellular)
T cells achieve immunocompetence in
T cells undergo positive selection in the thymus, which means
multiply and form clones of identical T cells
which of the following cannot act as antigen presenting cells
antigen presenting cells usually display processed antigens to T cells in the
Helper T cells (Th cells) do not
secrete fever producing chemicals
Memory T cells can live up to
which is the correct sequence of events in the humoral immune response
antigen recognition, antigen presentation, clonal selection, differentiation, attack
constitutes about 80% of circulating antibodies in plasma.
Before B cells secrete antibodies they differentiate into
any disease causing agent is a pathogen
the immune system spans nearly every organ and tissue in the human body
adaptive immunity involves skin, NK cells and phagocytosis
humoral immunity produces memory by increasing the number of cells and antibodies that can fight off a pathogen in the secondary response
cellular immunity uses B cells and humoral immunity uses antibodies
Cellular immunity uses MHC-I and MHC-II, but humoral immunity uses only MHC-II.
do lymph nodes have more vessels entering or leaving
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