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NSG 5003 QUIZES Week 6-10

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NSG 5003 QUIZES Week 6-10 MID TERM EXAM Question : What two types of hearing loss are associated with noise? Question 7. Question : A hypersensitivity reaction that produces an allergic response is called: Question 8. Question : Which cytokine is produced and released from virally infected host cells? Question 10. Question : Which T-lymphocyte phenotype is the key determinant of childhood asthma? Question 12. Question : Some older adults have impaired inflammation and wound healing because of which problem? Question 13. Question : The role of cytokines in cell reproduction is that they: Student Answer: Provide growth factor for tissue growth and development. Block the progress of cell reproduction through the cell cycle. Restrain cell growth and development. Provide nutrients for cell growth and development. Instructor Explanation: Growth factors, also called cytokines, are peptides that transmit signals within and among cells. They have a major role in the regulation of tissue growth and development. The remaining options do not correctly describe the role of cytokines in cell reproduction. Question 15. Question : Which characteristic is the most important determinant of immunogenicity when considering the antigen? Student Answer: Size Foreignness Complexity Quantity Instructor Explanation: Foremost among the criteria for immunogenicity is the antigen’s foreignness. A self-antigen that fulfills all of these criteria except foreignness does not normally elicit an immune response. Thus most individuals are tolerant of their own antigens. The immune system has an exquisite ability to distinguish self (self-antigens) from nonself (foreign antigens). The other options are considered when determining immunogenicity. Question 16. Question : How do cells receive communication from the extracellular fluid surrounding them? Student Answer: Through the protein channel (gap junction) Via the plasma membrane–bound signaling molecules (involving receptors) Through hormone secretion such as neurotransmitters By chemical messengers such as ligands Instructor Explanation: Cellular communication can occur by the binding of a chemical massager (a ligand) to a specific membrane receptor that is closely associated with the channel (e.g., G proteins). The other options do not correctly describe how cells communicate.

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