Concept explainers
Videos
Cells that target and kill body cells infected by viruses are
a. macrophages.
b. natural killer cells.
c. monocytes.
d. neutrophils.
Introduction:
Innate is the non-specific type of defense of body which develops quickly. It provides general response regardless of pathogen type and exposure numbers. It nonspecifically kills the pathogen that invades the body. Phagocytic cells are the part of the innate immunity that circulates in the body and attack the pathogens.
Answer to Problem 1U
Correct answer:
Natural killer cells are the cells that targets and kill body cells infected by viruses. Therefore, option b. is correct.
Explanation of Solution
Reason for the correct statement:
The small populations of lymphocyte that act in distinct manner than the other lymphocytes that participates in the adaptive defense mechanism are known as natural killer cells. They do not kill pathogen by phagocytosis instead they kill the cells of the body that infected with virus through apoptosis (programmed cell death).
Option b. is given as “natural killer cells”.
As, “the cells that target and kill the virus infected body cell with the process of programmed cell death (apoptosis) are natural killer cells, is the right answer.
Hence, option b. is correct.
Reason for the incorrect statements:
Option a. is given as “macrophages”.
Macrophages are irregular large shaped cells that kill the pathogen by phagocytosis. So, it is a wrong answer.
Option c. is given as “monocytes”.
Monocytes are undifferentiated macrophages that mature into “active phagocytic macrophage” at the site of infection. So, it is a wrong answer.
Option d. is given as “neutrophils”
These are the first cells that appear on the site of the infection and perform phagocytosis with even high range of reactive radicals of oxygen. So, it is a wrong answer.
Hence, option a., c., and d. are incorrect.
Natural killer cells are the cells that provide immunity against viruses and cancer cells by inducing programmed cell death of the infected cell.
Want to see more full solutions like this?
Chapter 51 Solutions
Biology with Connect Access Card
- Upon further testing, it is found that Matthew in question 4 does have normal cellular immunity. However, without antibodies Matthew will be less able to a. destroy cancer cells. b. destroy virus-infected cells. c. bind viral particles. d. destroy intracellular pathogens.arrow_forwardinterferons: a. cause inflammation b. inhibit viral infection c. aid in phagocytosis d. decrease the body temperaturearrow_forwardB cells that produce and release large amounts of antibody are called: a. Memory cells b. Basophils c. Plasma cells d. Killer cells e. Neutrophilsarrow_forward
- A young woman was in a car accident and had to have her spleen removed as a consequence of its rupture during the accident. She now has a greater risk of a. an overactive immune response. b. bacterial infections. c. low blood pressure. d. a pathogen surviving in her lymph.arrow_forwardWhich cell is not a phagocyte?a. neutrophil c. dendritic cellb. lymphocyte d. macrophagearrow_forwardDescribe the major functions of: a. lymph nodes b. spleen c. MALT d. Thymusarrow_forward
- Histamine and leukotrienes are released from_________. Select one: a. macrophages and microphages b. basophils and mast cells c. phagocytes d. eosinophils and basophils e. neutrophils and lymphocytesarrow_forwardExplain why each choice (a-d) is correct or incorrect. All but one of the following occurs during the inflammatory response. Select the example below that does NOT describe the process of inflammation. a. Inflammation increases capillary permeability. b. Chemotaxis draws leucocytes to the site of injury. c. Vasoconstriction prevents excessive blood loss due to injury. d. Release of prostaglandins results in pain.arrow_forwardWhich of the following is not a characteristic of inflammation? a. inactivation of macrophages b. increased vascular permeability and edema c. vasodilation d. pain e. influx of leukocytes.arrow_forward
- Which of the following sudden changes might be a result of an infection? a. increase in the activity of white blood cells b. decrease in the activity of antigens produced by the mitochondria c. decrease in the amount of DNA present in the nuclei of cells d. increase in the number of red blood cellsarrow_forwardSuppose a person recovers normally from viral infections, but then gets the same viral infections over and over again- unlike the rest of us. A. What is probably wrong –B cells, helper T cells and/or cytotoxic T cells? B. Should this person be at a higher risk of cancer than the rest of us? C. Should this person be able to lyse bacterial cells as well as the rest of us? D. Should this person tolerate a graft (from an unreated person) better than you are me?arrow_forwardThe photomicrograph shows a section of synovium from the knee joint of a patient with rheumatoid arthritis (RA). Which of the following are the most abundant cells in the inflammatory infiltrate? A. Eosinophils B. Langhans type giant cells C. Lymphocytes and plasma cells D. Neutrophils E. Type A and B synovial cellsarrow_forward
Human Anatomy & Physiology (11th Edition)BiologyISBN:9780134580999Author:Elaine N. Marieb, Katja N. HoehnPublisher:PEARSON
Biology 2eBiologyISBN:9781947172517Author:Matthew Douglas, Jung Choi, Mary Ann ClarkPublisher:OpenStax
Anatomy & PhysiologyBiologyISBN:9781259398629Author:McKinley, Michael P., O'loughlin, Valerie Dean, Bidle, Theresa StouterPublisher:Mcgraw Hill Education,
Molecular Biology of the Cell (Sixth Edition)BiologyISBN:9780815344322Author:Bruce Alberts, Alexander D. Johnson, Julian Lewis, David Morgan, Martin Raff, Keith Roberts, Peter WalterPublisher:W. W. Norton & Company
Laboratory Manual For Human Anatomy & PhysiologyBiologyISBN:9781260159363Author:Martin, Terry R., Prentice-craver, CynthiaPublisher:McGraw-Hill Publishing Co.
Inquiry Into Life (16th Edition)BiologyISBN:9781260231700Author:Sylvia S. Mader, Michael WindelspechtPublisher:McGraw Hill Education