Question

question list (5 items) (drag and drop into the appropriate area) correct answer list first event selectins bind to carbohydrates on the surface of leukocytes, causing them to stick. cytokines are released at sites of infection or inflammation and stimulate endothelial cells of blood vessels. leukocytes crawl out of vessel into adjacent tissue. endothelial cells express selectins on their plasma membrane. leukocytes roll along vessel walls.

Explanation:

The immune - response process starts with cytokines being released at sites of infection or inflammation which stimulate endothelial cells of blood vessels. Then, endothelial cells express selectins on their plasma membrane. These selectins bind to carbohydrates on the surface of leukocytes causing them to roll along vessel walls. Finally, leukocytes crawl out of the vessel into adjacent tissue.

Answer:

1. Cytokines are released at sites of infection or inflammation and stimulate endothelial cells of blood vessels.
2. Endothelial cells express selectins on their plasma membrane.
3. Leukocytes roll along vessel walls.
4. Leukocytes crawl out of vessel into adjacent tissue.
5. Selectins bind to carbohydrates on the surface of leukocytes, causing them to stick.