BIOS 242 Exam 3 QUESTIONS AND VERIFIED CORRECT ANSWERS GRADED A+ -LATEST - GUARANTEED PASS.docx

BIOS242 Exam3 QUESTIONS AND
VERIFIED CORRECT ANSWERS
GRADED A+ [LATEST 2026-2027] 100%
GUARANTEED PASS




what is the second line of defense - CORRECT 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 - CORRECT ANSWER-third



what is the third line of defense - CORRECT 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 - CORRECT ANSWER-- B cells

- T cells



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



where do B cells mature - CORRECT ANSWER-bone marrow

, where do T cells mature - CORRECT ANSWER-thymus



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



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

- attaches to antigens and tags them for destruction or neutralization



what are the 3 granulocytes - CORRECT ANSWER-- neutrophil

- eosinophil

- basophil



what are the 2 agranulocytes - CORRECT ANSWER-- lymphocytes

- monocytes



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

- 2 types: B & T lymphocytes

- B cells form plasma cells

- T cells kill foreign cells



describe monocytes (5) - CORRECT ANSWER-- largest of all WBC

- 3-7% of circulating WBC

- cytoplasm has granules that contain digestive enzymes

- released from marrow into blood

- macrophages are monocytes that have left blood circulation