MCB 3020 EXAM | QUESTIONS AND ANSWERS | 2026 UPDATE | WITH COMPLETE SOLUTIONS 100% CORRECT

MCB 3020 EXAM 5 WITH QUESTIONS
AND ANSWERS 2026/2027 100%
CORRECT


What is margination in leukocyte migration? - ANSWER>Margination: weak interaction of leukocytes with


endothelial cells lining the blood vessel near the site of injury.




What is attachment in leukocyte migration? - ANSWER>Attachment: leukocytes bind tightly to wall.




What is diapedesis in leukocyte migration? - ANSWER>Diapedesis: leukocytes move between endothelial cells.




What is chemotaxis in leukocyte migration? - ANSWER>Chemotaxis: movement in tissue to injury.




What must recruited leukocytes do in damaged or invaded tissue? - ANSWER>Must clear the damaged or invaded


tissue from foreign particles.

, What are the two main functions of recruited leukocytes? - ANSWER>Perform 2 important functions: Phagocytosis


and Secretion of cytokines.




What are the 4 steps of phagocytosis? - ANSWER>1. attachment


2. internalization


3. degradation


4. exocytosis




What happens during attachment in phagocytosis? - ANSWER>Phagocytes attach to damaged and dead cells and


bacteria.




What enhances phagocytosis greatly? - ANSWER>Opsonins (opsonization).




What are opsonins? - ANSWER>Proteins (ex. antibodies) that bind tightly to the foreign material.




How much do opsonins increase engulfment and destruction? - ANSWER>4000 times faster engulfment and


destruction.