Which of the following is a part of the second line of defense against mircroorg
ID: 90226 • Letter: W
Question
Which of the following is a part of the second line of defense against mircroorganisms? a. Phagocytes b. Keratin c. Gastric Juice d, Cilia Phagocyte mobilization involves: a. Monocytes are the most active phagocyte. b. Diapedesis, during which cells line up against the capillary wall. c. Mainly netrophil and macrophage migration into inflammed areas. d. Margination, which is the process of white cell movement through the walls of capillaries into injured tissues. Helper T cells: a. Bind tightly to target cells and release a lymphotoxin called perforin. b. often function to decrease the immune response. c. Release B7 proteins. d. Function in the adaptive immune system activation.Explanation / Answer
1. The first line of defense of the immune system pertains to physical and chemical barriers, like cilia, gastric juices, white blood cells, etc. The second line of defense involves non-specific resistance using phagocytes that ingest and destroy all microbes that enter the body.
Thus, the answer is A) Phagocytes
2. In diapedesis, the cells do not line up against the cappilary walls, rather, they pass through them and move towards the site of tissue damage or infection. Margination refers to the adhesion of white blood cells to damaged blood vessels. Neutrophils,in addition to monocytes, are the most active phagocytes. Phagocytic mobilization involves the recruitment and migration of phagocytes like neturophils and macrophages to site of injury/inflammation.
Thus, the answer is C) mainly neutrophil and macrophage migration into inflammed areas
3. Helper T cells play a major role in the adaptive immune system by activating other immune cells, like B cells, macrophages, and cytotoxic T cells.
Thus, the answer is D) Function in the adaptive immune system activation
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