Question

Diapedesis

A) the squeezing of cells through thelining of capillaries to attack invading microbes
B) release prostaglandins and leukotrienes in response to microbes
C) the movement of a cell towards or away from a chemical stimulus
D) increase in number of allergies and helminth infection
E) the coating of a pathogen by complement

Answer 1

Diapedesis is the process by which leukocytes pass through the vessel wall to enter tissues and combat infection, often in response to chemical signals, a phenomenon called positive chemotaxis.

Step-by-step explanation:

The process by which leukocytes squeeze through adjacent cells in a blood vessel wall is called diapedesis or transendothelial migration. This is a critical part of the body's immune response, allowing white blood cells to leave the circulation and enter the tissues to combat infection. During inflammation, chemicals such as cytokines and histamines cause blood vessels to dilate and become more permeable, facilitating the movement of leukocytes to the site of infection or injury. The leukocytes then follow chemical signals, a process known as positive chemotaxis, to the source of the infection where they can exert their immune functions such as phagocytosis.