ch 21 practice exam Flashcards
memory T cells can be up to ____ old
decades
cytotoxic T cells are like natural killer cells because they both
secrete granzymes and perforin
______ are found especially in the mucous membrane standing guard against parasites and allergens
eosinophils
which of the following cannot act as antigen-presenting cells
antibodies
which force does NOT help lymph to flow
the lymphatic node pump
basophils of the blood help to get defensive leukocytes to the site quickly by releasing an anticoagulant called _____ and a vasodilator called ______
heparin
histamine
before B cells secrete antibodies they differentiate into
plasma cells
helper T cells do not
secrete fever-producing chemicals
a pyrogen is a substance that causes
fever
lymphatic vessels recover about _______ of the fluid filtered by capillaries
15%
lymph is similar to blood plasma but very low in
protein
the _____ tonsils are the largest and their surgical removal (tonsillectomy) used to be one of the most common surgical procedures performed in children
palatine
_____ lacks the capacity to remember a pathogen 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
T cells achieve immunocompetence in the
thymus
special lymphoid vessels called lactelas absorb dietary ______ that are not absorbed by the blood capillaries
lipids
perforin is released by
cytotoxic T cells
______ are the largest of the lymphatic vessels and they empty into the ______
collecting ducts
subclavian veins
which is common in the distal small intestine
aggregated lymphoid nodules
which of the following is NOT an ex of lymphoid tissue
macrophages
vaccination stimulates _______ immunity
artificial active
adaptive immunity involves macrophages, antibodies, and interleukin
true
clonal selection of T cells happens in the thymus
false
interferons are secreted in response to bacterial infections
true
cellular immunity uses MHC-I and MHC-II but humoral immunity uses only MHC-II
true
red bone marrow is where all immune cells of the lymphoid system originate
true
a pathogen is a disease-causing microbe
true
antibodies and complement can work together linking innate and adaptive immunity
true
most memory B cells are found circulating in the lymph
false
interleukins are chemical signals by which immune cells communicate with each other
true
lymph originates in blood capillaries that pick up tissue fluid
false
cytotoxic T cells degrade after coming in contact with an infected cell
false
Pus is made of dead neutrophils, macrophages, and other tissues debris from a damaged tissue
true
helper T cells respond only to epitopes attaches to MHC proteins
true
the immune system spans nearly every organ and tissue in the human body
true
an allergic reaction is a form of hyposensitivty
false
the lymphoid system is involved in fluid recovery, immune surveillance, and lipid absorption
true
humoral immunity takes care of intracellular viruses whereas cellular immunity takes care of extracellular viruses
false
cytotoxic T cells respond only to antigens bound by MHC-I proteins
true
cellular immunity uses B cells and humoral immunity uses antibodies
false
the antigenicity of a molecule is due to specific regions of it called haptens
false
removal of the _____ would be more harmful to a 1 year old child than an adult
thymus
some antibodies against foreign antigens can react to similar self-antigen causing an autoimmune disease
true
