BIO 256 - Exam 4 | Questions and Answers | 100 out of 100 | Correct Elaborations | Update | 100% Guaranteed Pass

BIO 256 - Exam 4 (Total score 100%) Questions and Answers (Chamberlain University). Which cell resides in tissues to prevent infections? Macrophages The redness and heat of an inflamed area are due to a local hyperemia caused by vasodilation. Pyrogens, secreted by activated phagocytes, cause fever During fever, your liver and spleen sequester iron and zinc. This inhibits the growth of microorganisms. Select the correct statement about antigens. One antigen may have many different antigenic determinants and may therefore cause the formation of more than one antibody. Cytotoxic T cells Cancer cells and virus-infected body cells can be killed before activation of the immune system by natural killer cells. Clonal selection of B cells results in the formation of plasma cells Which of the following is true about the number of binding sites per functional antibody unit? IgM contains 10 binding sites. Which is an antibody attached to mast cells and basophils that makes them release histamine when an antigen binds it? IgE Why don't you get the mumps twice? Immune memory and the secondary immune response stop reinfection. Which of the following is associated with passive immunity? passage of IgG antibodies from a pregnant mother to her fetus Human cells infected with a virus or intracellular parasite are mostly eliminated by the work of T-lymphocytes. Which of the following is NOT a mechanism for the development of autoimmune disorders? a second exposure to an allergen The single most effective way to prevent the spread of disease is handwashing The factors responsible for holding the lungs open include surface tension of pleural fluid and no outside opening to the pleural cavity. Surfactant helps to prevent the alveoli from collapsing by by reducing the surface tension of alveolar fluid. Inspiratory capacity is the total amount of air that can be inspired after a tidal expiration. Boyle's law states that at a constant temperature, the volume of a gas varies inversely with pressure. Expired air has a greater oxygen content than alveolar air because alveolar air mixes with air in the anatomical dead space on its way out. What causes hemoglobin to release oxygen to body tissues? decreased tissue pH due to carbon dioxide production With the Bohr effect, more oxygen is released to the tissues because a decrease in pH (acidosis) weakens the hemoglobin-oxygen bond. The partial pressure of oxygen is higher in the pulmonary veins than in pulmonary arteries. True We have an expert-written solution to this problem! When a person holds their breath as long as they can, they have induced respiratory acidosis. Which is a site of both secretion and reabsorption? distal convoluted tubule What would happen if the kidney's capsular hydrostatic pressure were increased above normal? Net filtration would decrease. We have an expert-written solution to this problem! Reabsorption of high levels of glucose in filtrate is accomplished by secondary active transport. Which process eliminates plasma urea reabsorbed by passive processes? tubular secretion The ascending limb of the loop of Henle is permeable to ions but not water. Which statement is correct? Reabsorption of water is hormonally controlled. If the glomerular filtration rate is high, you expect the clearance value for urea to be high Which statement is true about urine? Urine contains nitrogenous wastes such as urea and uric acid Which of the following acts as the trigger for the initiation of micturition (voiding)? The stretching of the bladder wall serves as the trigger. We have an expert-written solution to this problem! Which of the following is not true regarding the immunocompetence of B and T cells? Exposure to foreign antigens in the bone marrow or thymus determines which antigens immune cells will recognize and resist Which is an electrolyte? Na+ Antibody receptor variability is produced by Selective splicing of VDJ segments of antibody producing genes When alveolar (or intrapulmonary) pressure is less than atmospheric pressure, air moves __ the lungs. into Which of the following hormones is most important in stimulating water conservation in the kidneys, effecting the permeability of the collecting duct? antidiuretic hormone Decreased airway resistance means the airways have been dilated Which of the following hormones is important in the regulation of sodium ion concentrations in the interstitial fluid? Hint: it promotes Na/K exchange. aldosterone The maintenance of the proper pH of the body fluids may be the result of the control of respiratory ventilation.