Concept explainers
Videos
_____ 1. All of the following are phagocytic cells except
- a. neutrophils.
- b. T-lymphocytes.
- c. macrophages.
- d. eosinophils.
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.
The neutrophils, macrophages, and eosinophils all are phagocytic cells because they show phagocytosis, but T-lymphocytes releases cytokines to eliminate pathogens.
Want to see more full solutions like this?
Chapter 22 Solutions
Connect Access Card for Anatomy & Physiology
- Selection of Traits What adaptations do scavengers have for locating and feeding on prey? What adaptations do predators have for capturing and consuming prey?arrow_forwardCompetition Between Species What natural processes limit populations from growing too large? What are some resources organisms can compete over in their natural habitat?arrow_forwardSpecies Interactions Explain how predators, prey and scavengers interact. Explain whether predators and scavengers are necessary or beneficial for an ecosystem.arrow_forward
- magine that you are conducting research on fruit type and seed dispersal. You submitted a paper to a peer-reviewed journal that addresses the factors that impact fruit type and seed dispersal mechanisms in plants of Central America. The editor of the journal communicates that your paper may be published if you make ‘minor revisions’ to the document. Describe two characteristics that you would expect in seeds that are dispersed by the wind. Contrast this with what you would expect for seeds that are gathered, buried or eaten by animals, and explain why they are different. (Editor’s note: Providing this information in your discussion will help readers to consider the significance of the research).arrow_forwardWhat is the difference between Uniporters, Symporters and Antiporters? Which of these are examples of active transport?arrow_forwardWhat are coupled transporters?arrow_forward
- How do histamine and prostaglandins help in the mobilization of leukocytes to an injury site? What are chemotactic factors? How do they affect inflammation process?arrow_forwardCompare and contrast neutrophils and macrophages. Describe two ways they are different and two ways they are similar.arrow_forwardDescribe the effects of three cytokines (not involved in the initial inflammation response). What cells release them?arrow_forward
Medical Terminology for Health Professions, Spira...Health & NutritionISBN:9781305634350Author:Ann Ehrlich, Carol L. Schroeder, Laura Ehrlich, Katrina A. SchroederPublisher:Cengage Learning