BIOS 242 Exam 3 Questions and Answers Correctly solved to Score A+

BIOS 242 Exam 3 Questions and
Answers Correctly solved to Score A+
what lines of defense are part of innate immunity - Answer - first

- second



what is the first line of defense - Answer surface protection composed of anatomical and physiological
barriers



what are 2 examples of the first line of defense - Answer - physical barriers

- chemical barriers



what are 2 examples of physical barriers - Answer - skin

- mucous membranes



what are 6 examples of chemical barriers - Answer - lysozyme

- sweat

- skins acidic pH

- hydrochloric acid

- bile and digestive juices

- resident microbiota



what are 4 examples of the second line of defense - Answer - phagocytosis

- inflammation

- fever

- antimicrobial proteins



what is the second line of defense - Answer a cellular and chemical system that comes immediately into
play if infectious agents make it past the first line of defense

, what line of defense is part of acquired immunity - Answer third



what is the third line of defense - Answer specific host defenses that must be made uniquely for each
microbe through the action of special leukocytes



what are 2 examples of the third line of defense - Answer - B cells

- T cells



what is the first line of defense in the mouth - Answer saliva which contains lysozyme



where do B cells mature - Answer bone marrow



where do T cells mature - Answer thymus



what is an antigen - Answer a foreign molecule or chemical substance that causes stimulates an immune
reponse



what is the role of plasma cells (2) - Answer - produces antibodies (2,000/sec)

- attaches to antigens and tags them for destruction or neutralization



what are the 3 granulocytes - Answer - neutrophil

- eosinophil

- basophil



what are the 2 agranulocytes - Answer - lymphocytes

- monocytes



describe lymphocytes (4) - Answer - 20-35% of circulating WBC