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Walden PUBH6170 quiz 5




Question;Question 1Which of the following white blood cells kills its target cells by releasing chemicals that break down the target cell membrane?Answernatural killer cellsB lymphocytesbasophilsT lymphocytesmacrophages1 points Question 2Which of the following is not true regarding the circulatory system?AnswerThis system ensures that waste products are removed from all tissues of the body.This system is made up of the blood vessels, heart, and blood.The circulatory system has an important role in the exchange of gases in the lungs.During fetal development, the circulatory system develops from the lymphatic system.This system carries excess water and salts to the urinary system.1 points Question 3Eosinophils are especially important in defending the human body from infection by:Answerbacteria.viruses.molds.large parasites.both bacteria and viruses.1 points Question 4The primary immune responseAnswerinvolves recognition of an antigen.typically has a lag time of 3 days.involves the production and proliferation of T cells.produces antibodies and immunity.All of the above1 points Question 5An increased risk for cardiovascular health problems is associated with:Answeran elevated level of hemoglobin.high blood levels of HDLs.decreased production of albumins.high blood levels of LDLs.low blood levels of LDLs.1 points Question 6In some countries, there is not enough money to support the development of vaccines, those that are developed are difficult to administer. Therefore, researchers are attempting to genetically engineer bananas to produce oral vaccines, making it easier to deliver the vaccine to individuals.AnswerTrueFalse1 points Question 7Hemolytic disease of the newborn could result from which of the following situations?Answermom is Rh+, fetus is Rh-mom is Rh-, fetus is Rh+mom is Rh+, fetus is Rh+mom is Rh-, fetus is Rh-either C or D1 points Question 8Which of the following is not true regarding the immune response?AnswerThe immune response uses chemical and phagocytic cells to destroy foreign cells.Once initiated, the immune response provides protection for the entire body.The key to immune response is the ability of the components involved to be able to distinguish between the body cells and foreign cells.The immune response involves the activities of proteins, cells, and the lymphatic system.The immune response involves the ability to "remember" exposures to pathogens in order to increase the rate of response upon subsequent infections by that pathogen.1 points Question 9Which of the following is not true regarding the lymphatic system?AnswerLymphatic vessels have valves that keep lymph moving in one direction.Blood flows into lymphatic capillaries, is filtered, and then flows out of lymphatic capillaries.Lymph contains proteins, fats, and white blood cells.Lymphatic vessels merge to form the thoracic duct and right lymphatic duct.Lymph is transported to the bloodstream.1 points Question 10Which of the following types of white blood cells is capable of phagocytosis?AnswereosinophilsbasophilsneutrophilsB lymphocytesboth eosinophils and B lymphocytes1 points Question 11Why do some physicians advise patients with a bladder infection to drink a lot of cranberry juice?AnswerCranberry juice contains chemicals that kill viruses and bacteria.The increased volume of fluid in the bladder causes bacterial cells to burst as they absorb the excess fluid.Cranberry juice makes the urine more acidic, decreasing the rate at which microorganisms can grow and reproduce.Cranberry juice increases the efficiency of urine production by the kidneys.all of the above1 points Question 12Which of the following is not true regarding macrophages?Answerremove and destroy old blood cells and tissue debrisrelease chemicals that stimulate the production of other white blood cellsdevelop from B lymphocytes in response to the presence of an antigenare capable of phagocytosisare active within the tissues1 points Question 13Non specific defenses in the human body include all of the following exceptAnswercell-mediated immunityphagocytosisinterferonsthe inflammatory responsethe complement system1 points Question 14Which of the following body fluids is not known to transmit HIV from human to human?Answerbloodsemensalivavaginal fluidbreast milk1 points Question 15About 55% of whole blood is ____, which is mostly made up of water.Answerplasmahemoglobinwhite blood cellsclotting proteinshematocrit


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