When does positive chemotaxis occur?Multiple choice question.when damaged cells release chemicals that activate plateletswhen damaged cells convert fibrinogen to fibrinwhen damaged cells release chemicals that attract leukocytes

The process called ______ results in leukocytes being attracted to a site of tissue damage. They are attracted by chemicals released by damaged cells.Multiple choice question.diapedesispositive chemotaxisameboid motion

Which statement BEST DESCRIBES the phenomenon of chemotaxis in the staged process of neutrophil phagocytosis?Select one alternative:A neutrophil moves up a chemokine gradient towards the infectionA neutrophil tethers to the inside of the capillary wallA neutrophil adheres to the inside of the capillary wall and flattens.A neutrophil squeezes through the junction between endothelial cells.

1. Chemotaxis is: a. Phagocytosis of infective agent. b. Rolling of leukocytes on endothelial surface. C. Adhesion of leukocytes to endothelium. d. Movement of extravasated neutrophils toward infective agent. 2. Which is FALSE about macrophages: a. They influence process of repair. b. After the end of inflammation they die and wander off into blood stream. C. They are derived from monocytes d. Capable of phagocytosis. 3. one of the following is an example of diffuse suppurative inflammation a. Carbuncle. b. Cellulitis. c. Boil. d. Abscess. 4. Pseudomembranous inflammation is: a. Mild form of acute suppurative inflammation. b. Caused by toxin producing bacterial c. Seen in serous cavities d. Caused by pyogenic bacteria. 5. By definition, granulomas are composed of: a. Cholesterol clefts. b. Endothelial cells and fibroblasts. c. Localized aggregation of activated macrophages. D. Hemosiderin-laden macrophages 6. Granulation tissue is: a. Avascular scar tissue. b. Occurs during early healing by regeneration. C. Pale& dry. d. Formed of fibroblasts & proliferating new capillaries. 7. All of the following can heal by regeneration EXCEPT: a. Liver cells. b. Endometrial lining. c. Nerve cells d. Hematopoietic cells. 8. In liver healing by fibrosis (liver cirrhosis) occurs if: a. Injury affects parenchymal cells only. b. Injury affects portal tracts only. c. Injury affects the peritoneal covering. d. Injury affects liver cells & the framework. 9. All of the following are complications of wound healing EXCEPT: a. Cosmetic deformity b. Carcinoma. c. Dermoid cyst. d. Chronic sinus 10. In acute inflammation TNF enhances: a. Redness and hotness. b. Expression of adhesion molecules on endothelium and inflammatory cells. c. Increase of vascular permeability. d. Pain. 11. Chemotactic factors include the following: a. Histamine. b. Prostaglandins. c. C5a. d. Lysosomal enzymes. 12. As regard the cellular events of acute inflammation: a. Neutrophils then monocytes accumulate within the extravascular space. b. The adhesion of neutrophils to the vascular endothelium at the sites of acute inflammation is called 'rolling' C. Integrin play a role in margination. d. Emigration of leucocytes is followed by leucopenia. 13. The key cells in chronic inflammation: a. Lymphocytes. b. Plasma cells. c. Macrophages. d. Eosinophils. 14. A sinus is: a. A local defect within a surface. b. A blind-ended tract. c. A tract communicating between two surfaces. d. Overdone repair. 15. PSA is a marker of: a. Nephroblastoma. b. Squamous cell carcinoma. C. Prostatic carcinoma. d. Granulosa cell tumour of ovary. 16. Aflatoxins are carcinogen for: a . Bronchogenic carcinoma. b. Renal cell carcinoma. c. Hepatocellular carcinoma. d. Urothelial carcinoma of the bladder. 17. Epstein-Barr virus is a cause the following tumor: a. Burkitt's lymphoma. b. Lung carcinoma. c. T cell lymphoma. d. Basal cell carcinoma.

Chemicals released by damaged cells, white blood cells, and platelets act to attract white blood cells to the area. What is this attraction called?Multiple ChoiceAgglutinationPositive chemotaxisDiapedesisInflammation

Multiple Choice QuestionWhen microorganisms invade tissues, leukocytes release chemicals that ______, producing swelling that delays the spread of pathogens to other areas of the body. Multiple choice question.constrict small blood vesselsdilate small blood vessels make large blood vessels less permeablemake small blood vessels more permeable