Chapter 21-Immune system

Question 1

Importance of phagocytosis

Answer 1

It’s important because it is a process where pathogens that made it through the first line of defense (membrane barrier) are stopped and engulfed by phagocytes.

Question 2

Importance of natural killer cells

Answer 2

a unique group of defensive cells that can lyse and kill cancer cells and virus infected body cells before the adaptive is activated. NK cells can eliminate a variety of infected or cancerous cells by detecting the lack of “self” cell-surface receptors and by recognizing certain surface sugars on the target cell

Question 3

Cells of the innate immune system

Answer 3

Epithelial barriers
phagocytes
dendritic cells
plasma proteins
Natural Killer Cells

Question 4

Surface membrane barriers

Answer 4

The acidity of skin secretion inhibits bacterial growth
The stomach mucosa secrete a concentrated HCL solution and protein digesting enzymes to kill microorganisms
Saliva and lacrimal fluid contain lysozyme, an enzyme that destroy bacteria