front 1 ![]() Adjacent cells in lymphatic capillaries overlap each other loosely. These cells form a unique structural modification that increases their permeability that is known as the __________. | back 1 minivalves |
front 2 ![]() Which of the following promotes closure of the minivalves associated with lymph capillaries? | back 2 increasing pressure inside the lymph capillary |
front 3 ![]() To what organ do the lymphatic vessels return protein-rich escaped fluids to rejoin circulation? | back 3 heart |
front 4 ![]() What do collecting lymphatic vessels NOT share in common with veins of the cardiovascular system? | back 4 thickness of the walls |
front 5 ![]() What is the main function of the lymphatic system? | back 5 The lymphatic system returns leaked fluid and plasma proteins that escape from the bloodstream to the blood. |
front 6 ![]() Which of the following lacks lymph capillaries? | back 6 bones and teeth |
front 7 ![]() Lymph from the right leg ultimately is delivered to which duct in the thoracic region? | back 7 thoracic duct |
front 8 ![]() Lymph from what regions of the body is drained into the right lymphatic duct? | back 8 right upper limb, right side of the head and thorax |
front 9 ![]() What is the name of the enlarged sac to which the lumbar trunks and the intestinal trunk returns lymph? | back 9 cisterna chyli |
front 10 ![]() Which of the following returns lymph to the right lymphatic duct? | back 10 right side of the head |
front 11 ![]() Which of the following delivers lymph into the junction of the internal jugular vein and the subclavian vein? | back 11 thoracic duct |
front 12 ![]() What type of tissue is commonly found in all lymphoid organs and tissues (except the thymus)? | back 12 reticular connective tissue |
front 13 ![]() What is the role of the B lymphocytes (B cells) in lymphoid tissue? | back 13 produce plasma cells that secrete antibodies |
front 14 ![]() What is the role of dendritic cells in lymphoid tissue? | back 14 capture antigens and bring them back to lymph nodes |
front 15 ![]() Which of these lymphoid organs is the thymus? Select from letters A-D. | back 15 B |
front 16 ![]() Which of these lymphoid organs destroys bacteria before it can breach the intestinal wall and generates "memory" lymphocytes for long-term memory? Select from letters A-D. | back 16 D |
front 17 ![]() Which letter represents the tonsils? Select from letters A-D. | back 17 A |
front 18 ![]() Where are the three large clusters of superficial lymph nodes? | back 18 cervical, inguinal, and axillary regions |
front 19 ![]() The filtration of lymph and immune system activation are the two basic functions of the __________. | back 19 lymph nodes |
front 20 ![]() Lymph nodes are surrounded by a capsule from which connective tissue strands extend inward to divide the node into compartments. What is the name of these strands? | back 20 trabeculae |
front 21 ![]() What region of the lymph node contains densely packed follicles with dividing B cells? | back 21 cortex |
front 22 ![]() Which lymphoid organ is primarily active during the early years of life? Select from letters A-D. | back 22 B |
front 23 ![]() Which of these lymphoid organs is a part of collection of tissues called the mucosa-associated lymphoid tissues (MALT) and removes pathogens entering the pharynx (throat)? Select from letters A-D. | back 23 A |
front 24 ![]() Which lymphoid organ extracts aged and defective blood cells and platelets from the blood in addition to storing some of the breakdown products for later reuse? Select from letters A-D. | back 24 C |
front 25 ![]() Which part of the spleen is the site of immune function? | back 25 white pulp |
front 26 ![]() Where are worn-out erythrocytes found in the spleen? | back 26 red pulp |
front 27 ![]() Where is the spleen located? | back 27 left side of the abdominal cavity just beneath the diaphragm and curled around the anterior aspect of the stomach |
front 28 ![]() Where is the lingual tonsil located? | back 28 base of the tongue |
front 29 ![]() Tonsillar crypts are invaginations deep into the interior of the tonsil. What is missing from the tonsil that allows for the presence of tonsillar crypts? | back 29 capsule |
front 30 ![]() Which tonsil is located in the posterior wall of the nasopharynx and is referred to as the adenoids if it is enlarged? | back 30 pharyngeal tonsil |
front 31 ![]() What type of cell is the precursor to the helper T cell? | back 31 CD4 cell |
front 32 ![]() What type of cell is a precursor to the cytotoxic T cell? | back 32 CD8 cell |
front 33 ![]() What activates CD8 cells? | back 33 antigen fragments on class I MHC proteins |
front 34 ![]() What type of T cell can directly attack and kill other cells, such as virus-infected cells? | back 34 cytotoxin T (TC) cells |
front 35 ![]() Cytotoxic T (TC) cells check cells of the body for identity flags to see if they look they way they are supposed to. What is this process called? | back 35 immune surveillance |
front 36 ![]() Which type of T cell will recognize antigens associated with an allograft? | back 36 cytotoxin T (TC) cell |
front 37 ![]() Which letter represents the formation of a phagolysosome resulting from the fusion of a lysosome with the phagocytic vesicle? Select from letters A-D. | back 37 C |
front 38 ![]() With what does our immune system coat pathogens to facilitate their capture and accelerate phagocytosis? | back 38 opsonins |
front 39 ![]() Which letter represents the adhesion of the phagocyte to the pathogen? Select from letters A-D. | back 39 A |
front 40 ![]() Four (or five) cardinal signs indicate inflammation. What specific sign of inflammation is the result of exudate in the tissue spaces? | back 40 edema (swelling) |
front 41 ![]() Which of the following inflammatory chemicals is released by mast cells? | back 41 histamine |
front 42 ![]() Which of the following is NOT one of the cardinal signs of inflammation? | back 42 vasoconstriction |
front 43 ![]() When do neutrophils enter the blood from the red bone marrow, in response to leukocytosis-inducing factors? | back 43 leukocytosis |
front 44 ![]() What is the main event of chemotaxis? | back 44 Neutrophils and other WBCs migrate up the gradient of chemotactic agents to the site of injury. |
front 45 ![]() Neutrophils flatten and squeeze between the endothelial cells of the capillary walls during what process? | back 45 diapedesis |
front 46 ![]() What protein can be released by infected cells to help protect cells that have not yet been infected? | back 46 interferons (IFNs) |
front 47 ![]() How do interferons protect against infection in healthy cells? | back 47 Interferons block viral reproduction in healthy cells through the production of antiviral proteins. |
front 48 ![]() What is the specific target of interferons? | back 48 nearby healthy cells |
front 49 ![]() Which cells mature in the thymus? | back 49 T cells |
front 50 ![]() How does a lymphocyte become immunocompetent? | back 50 Lymphocytes must be able to recognize their one specific antigen by binding to it. |
front 51 ![]() What are B and T cells called that have not yet been exposed to an antigen? | back 51 naive |
front 52 ![]() How would you classify the antivenom used to treat poisonous snake bites? | back 52 passive immunity, artificially acquired |
front 53 ![]() Which of the following exemplifies passive immunity? | back 53 antitoxin |
front 54 ![]() Which of the following best illustrates artificially acquired active humoral immunity? | back 54 vaccines |
front 55 ![]() What part of the antibody's structure determines its class? | back 55 constant (C) region |
front 56 ![]() Which immunoglobulin class can cross the placenta to provide naturally acquired passive immunity to the fetus? | back 56 IgG |
front 57 ![]() What is the first antibody released in the primary response and usually indicates infection? | back 57 IgM |
front 58 ![]() Which mechanism occurs when antibodies block specific sites on viruses or bacterial exotoxins? | back 58 neutralization |
front 59 ![]() Which of the following mechanisms of antibody action occur when red blood cells clump due to a transfusion of mismatched blood? | back 59 agglutination |
front 60 ![]() Which mechanism of antibody action results in cell lysis? | back 60 complement fixation and activation |