ANATOMY+PHYSIOLOGY (LOOSELEAF)
4th Edition
ISBN: 9781264265411
Author: McKinley
Publisher: MCG
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Textbook Question
Chapter 22, Problem 1DYKB
_____ 1. All of the following are phagocytic cells except
- a. neutrophils.
- b. T-lymphocytes.
- c. macrophages.
- d. eosinophils.
Expert Solution & Answer
Summary Introduction
Introduction:
The phagocytosis is the process in which the cells eliminate the pathogens by engulfing them. The substances which are engulfed by the cell may be infectious agents, cellular debris. This is a very common process for food intake in amoebas.
Answer to Problem 1DYKB
Correct answer:
The T-lymphocytes secrete cytokines and activate other cytotoxic T-lymphocytes to invade the pathogens. Therefore, option b. is correct.
Explanation of Solution
Reason for the correct statement:
Option b. is given as “T-lymphocytes”. The T-lymphocytes are the cells which provide protection against the antigens by releasing cytokines and also activate the cytotoxic cells which further release other cytokines. The infectious antigens are eliminated by the cytokines, not by phagocytosis process. Hence, the T-lymphocytes are not the phagocytic cells.
Hence, option b. is correct.
Reasons for incorrect statements:
Option a. is given as “neutrophils”. The neutrophils’ function is to destroy infectious agents through a process known as phagocytosis. It is the process in which the infectious agent is engulfed by the neutrophils. Neutrophils are phagocytic cells. Hence, option a. is incorrect.
Option c. is given as “macrophages”. The macrophages also involve the phagocytosis process in which the engulfed infectious agent is covered to form phagosome and interact with lysosomes to release a residue in the external environment. Macrophages are phagocytic cells. Hence, option c. is incorrect.
Option d. is given as “eosinophils”. Eosinophils also participate in the immune response associated with allergy and asthma and are involved in phagocytosis of antigen-antibody complexes. Eosinophils are phagocytic cells. Hence, option d. is incorrect.
Hence, options a., c., and d. are incorrect.
Conclusion
The neutrophils, macrophages, and eosinophils all are phagocytic cells because they show phagocytosis, but T-lymphocytes releases cytokines to eliminate pathogens.
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Chapter 22 Solutions
ANATOMY+PHYSIOLOGY (LOOSELEAF)
Ch. 22.1 - Which pathogen must enter a cell to replicate?...Ch. 22.2 - Prob. 2WDYLCh. 22.2 - What is the definition of a cytokine? How are...Ch. 22.2 - Prob. 4WDYLCh. 22.3 - Prob. 5WDYLCh. 22.3 - Prob. 6WDYLCh. 22.3 - Prob. 7WDYLCh. 22.3 - How do NK cells accomplish the task of eliminating...Ch. 22.3 - Prob. 9WDYLCh. 22.3 - Prob. 10WDYL
Ch. 22.3 - Prob. 11WDYLCh. 22.3 - Prob. 12WDYLCh. 22.4 - Prob. 13WDYLCh. 22.4 - What distinguishes a hapten from an antigen?Ch. 22.4 - Prob. 15WDYLCh. 22.4 - Which type of MHC class molecules is found on all...Ch. 22.4 - Prob. 17WDYLCh. 22.5 - Prob. 18WDYLCh. 22.5 - What would happen if a thymocyte that failed the...Ch. 22.5 - Prob. 20WDYLCh. 22.6 - Prob. 21WDYLCh. 22.6 - How do cytokines released by helper T-lymphocytes...Ch. 22.6 - Prob. 23WDYLCh. 22.6 - Prob. 24WDYLCh. 22.6 - Prob. 25WDYLCh. 22.7 - Prob. 26WDYLCh. 22.7 - Prob. 27WDYLCh. 22.7 - Prob. 28WDYLCh. 22.8 - Prob. 29WDYLCh. 22.8 - What are the six major functions of antibodies?...Ch. 22.8 - Which subclass of antibodies is most prevalent?...Ch. 22.9 - Prob. 32WDYLCh. 22.9 - Prob. 33WDYLCh. 22.9 - Prob. 34WDYLCh. 22 - _____ 1. All of the following are phagocytic cells...Ch. 22 - _____ 2. This cell releases cytokines to activate...Ch. 22 - _____ 3. This cell is activated by binding...Ch. 22 - _____ 4. These two cells destroy an infected cell...Ch. 22 - _____ 5. All of the following are functions of...Ch. 22 - _____ 6. The four characteristics of adaptive...Ch. 22 - _____ 7. During which process does additional...Ch. 22 - _____ 8. This chemical is released by...Ch. 22 - _____ 9. The correct sequence of the major events...Ch. 22 - Prob. 10DYKBCh. 22 - Compare the general characteristics of innate...Ch. 22 - Define the inflammatory response, and explain its...Ch. 22 - Describe an antigen.Ch. 22 - Describe class I and class II MHC molecules, and...Ch. 22 - Prob. 15DYKBCh. 22 - Prob. 16DYKBCh. 22 - Explain the general function of cytotoxic...Ch. 22 - Describe both the function of antibodies and...Ch. 22 - There are two branches of adaptive immunity:...Ch. 22 - Prob. 20DYKBCh. 22 - Prob. 1CALCh. 22 - Prob. 2CALCh. 22 - Prob. 3CALCh. 22 - Prob. 4CALCh. 22 - Prob. 5CALCh. 22 - Prob. 1CSLCh. 22 - Prob. 2CSLCh. 22 - Prob. 3CSL
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