What are macrophages, and what are their functions?
What will be an ideal response?
Macrophages are one of the principal phagocytic cells in the second line of defense. They are monocytes that have left the bloodstream and entered tissues. They are named according to their location in the body: wandering macrophages, alveolar macrophages (in the lungs), microglia (in the nervous system), and others. These phagocytes provide some protection against infection by phagocytizing microbes and are scavengers that clean the tissues of dead cells, debris, and inert foreign material (dust, etc). Macrophages also play a role in triggering acute inflammation by releasing various inflammatory chemicals when microbes are detected by means of TLRs (extracellular molecules) and NODs (intracellular molecules resulting from phagocytosis).
Bloom's Taxonomy: Comprehension
Section: The Body's Second Line of Defense
Learning Outcome: 15.10, 15.11, 15.14, 15.15
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The change in the chromosome depicted between the top and the bottom in the figure above represents
a(n) ____.
a. inversion b. duplication c. reciprocal translocation d. deletion e. Philadelphia chromosome
A motor neuron and the muscle cells it synapses with form a(n)
a. active site. b. action potential. c. motor unit. d. cross bridge. e. motor network.
Brittany worked in the produce department of a grocery store in the afternoons. She wondered how much the ripeness of bananas affected the sale of the fruit. She collected data for 10 days on the total number of pounds bananas sold of green, yellow, and brown-black bananas. What is the independent variable in her experiment?
A. Ripeness of bananas B. Type of people who buy different bananas C. The number of days the data was collected D. Amount of bananas sold
Which of the following is/are true of Hox genes?
A. they control the locations of specific parts of the body plan of plants and animals, such as the locations of eyes, limbs, or leaves B. they are evolutionarily conserved in all animals except sponges C. they activate expression of genes which control development of body segments D. they are chemical signals present in the unfertilized egg E. changes in Hox genes has contributed to rapid diversification of animal lineages