ultiple Choice Questions. CIRCLE YOUR ANSWERS. (2 pts each - 10 pts total) Effec
ID: 195474 • Letter: U
Question
ultiple Choice Questions. CIRCLE YOUR ANSWERS. (2 pts each - 10 pts total) Effectors of the humoral immune system are known as: A. antibodies. B. B cells. complement D. All of the above E. None of the above 2. Which of the following cell types are phagocytic? A Neutrophils C. D. E. Mast cells Tcells NK cells All of the above are phagocytic 3. Which of the following is NOT an effect of C3a and C5a binding with their receptors orn leukocytes? A. Increased vascular permeability via induction of cytokine secretion B. Induction of degranulation by granulocytes C. Increased smooth muscle contraction to aid in delivering immune cells and molecules to the site of infection All of the above are effects of C3a and C5a binding their receptors E. D. None of the above is an effect of C3a and C5a binding their receptors. How do memory cells develop? A. Tcells and B cells from the primary response persist and become reactivated. B. Upon re-infection, memory centers in the brain send signals to the bone marrow to induce T- 4. cell and B-cell differentiation. C. Innate cells are trained to activate new T cells and B cells more quickly with secondary infection D. T cells and B cells from the primary infection slowly mutate their receptors over time, priming themselves for the secondary response. E. Innate cells modify their cell surface receptors to prepare for re-infection. 5. A deficiency in which of the following complement proteins would cause defects in Classical, Lectin and Alternate complement activation pathways. A. C2 B. C3 C. Factor B D. Factor D E. C4Explanation / Answer
1. D) All of the above. The humoral immune response is mediated by antibodies, complement proteins and other macromolecule found in the extracellular fluid. Antibodies generated by B cell cause the destruction of foreign micro-organism. In addition complement system act to enhance the ability of antibodies and phagocytic cells in elimination pathogens from the host by attacking pathogens cell membrane.
2.A and B) Phagocytes are cells that can engulf foreign particles and destroy them. Phagocytic cells include macrophage, dendritic cell, neutrophils, mast cell. Neutrophils are small and granular leukocytes while monocytes are larger. Both NK cell and T cells are not phagocytic cells.
3. E) None of the above is an effect of C3a and C5a binding their receptors.
4. A) T cell and B cell from the primary response persist and become reactivated. Memory cells are derived from effector cells. If an organism has encountered an infection previously some of the T cell and B cell generated at that time turn into memory T cell and memory B cell. These cells stay in our body for a longer duration even if the infection is removed and provide protection when the same infection occur again.
5. B) C3. Since is the point at which all complement pathways such as classical, lectin and alternative complement activation pathways converge hence their deficiency can cause defect in all three pathways.
Related Questions
Navigate
Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.