NR-283 Pathophysiology Week 4 Quiz 2026/2027 | ACTUAL EXAM Verified Q&A with Rationales | Chamberlain | Pass Guaranteed - A+ Graded

Pass your NR-283 Pathophysiology Week 4 Quiz at Chamberlain University with this comprehensive resource featuring verified questions, answers, and detailed rationales – all 100% correct and A+ graded for the 2026/2027 curriculum. This A+ Graded resource for the NR-283 Pathophysiology Week 4 Quiz (2026/2027 | Chamberlain University) contains verified questions, answers, and rationales covering all essential topics related to infectious diseases and neoplasia (cancer). Comprehensive Content Coverage Includes: Infectious Diseases: Chain of infection: Infectious agent (pathogen) → reservoir (human, animal, environmental) → portal of exit → mode of transmission (contact – direct, indirect, droplet; airborne; vehicle; vector-borne) → portal of entry → susceptible host. Bacterial infections: Classification by shape (cocci, bacilli, spirilla), Gram stain (positive – thick peptidoglycan, purple; negative – thin peptidoglycan, pink), oxygen requirements (aerobic, anaerobic, facultative). Exotoxins (proteins released by bacteria – neurotoxins, enterotoxins, cytotoxins; highly potent, specific targets) vs. endotoxins (lipopolysaccharide in Gram-negative cell wall – released upon lysis, causes fever, shock, DIC). Examples – Streptococcus pyogenes (pharyngitis, rheumatic fever), Staphylococcus aureus (skin infections, toxic shock, MRSA), Escherichia coli (UTI, traveler's diarrhea), Clostridium tetani (tetanus – exotoxin), Neisseria meningitidis (meningitis – endotoxin). Viral infections: Structure (DNA or RNA, capsid, envelope). Viral replication cycle (attachment, penetration, uncoating, synthesis, assembly, release). Latent vs. lytic infections. Examples – influenza (orthomyxovirus, antigenic drift/shift), HIV (retrovirus, reverse transcriptase, CD4+ T cell depletion), herpes simplex (latent in ganglia, reactivation), varicella-zoster (chickenpox then shingles), hepatitis B and C (chronic liver disease, cirrhosis, HCC), COVID-19 (SARS-CoV-2, ACE2 receptor). Fungal infections (mycoses): Superficial (dermatophytes – tinea), subcutaneous (sporotrichosis), systemic (histoplasmosis, coccidioidomycosis, candidiasis – immunocompromised). Opportunistic fungi (Aspergillus, Cryptococcus in HIV/AIDS). Parasitic infections: Protozoa (malaria – Plasmodium, toxoplasmosis – Toxoplasma, giardiasis – Giardia), helminths (roundworms – Ascaris; tapeworms – Taenia; flukes – Schistosoma). Vector-borne transmission (mosquito – malaria, West Nile; tick – Lyme disease, babesiosis). Host response to infection: Fever (endogenous pyrogens – IL-1, TNF-α, IL-6; prostaglandin E2 in hypothalamus), leukocytosis (neutrophilia in bacterial, lymphocytosis in viral), acute phase reactants. Sepsis and septic shock – systemic inflammatory response syndrome (SIRS) due to infection, endothelial dysfunction, hypotension, organ failure. Neoplasia (Cancer Biology): Definitions: Neoplasm (abnormal mass of tissue with unregulated growth), benign (localized, well-differentiated, no metastasis, usually curable) vs. malignant (invasive, poorly differentiated, metastasis, life-threatening). Cancer (malignant tumor). Oncology (study of cancer). Carcinogenesis: Genetic and epigenetic alterations. Oncogenes (gain-of-function – promote cell growth – ras, myc, HER2/neu). Tumor suppressor genes (loss-of-function – inhibit cell growth – p53 "guardian of genome", Rb retinoblastoma, APC, BRCA1/BRCA2). Mutations – initiation (irreversible genetic change), promotion (proliferation of initiated cells), progression (additional mutations, increased malignancy). Carcinogens: Chemical (tobacco smoke – lung, bladder; asbestos – mesothelioma; benzene – leukemia; aflatoxin – liver), radiation (UV – skin cancer; ionizing radiation – thyroid, leukemia), viral (HPV – cervical, oropharyngeal; HBV/HCV – liver; EBV – lymphoma; HTLV-1 – leukemia), bacterial (H. pylori – gastric cancer), parasitic (Schistosoma – bladder cancer). Hormonal (estrogen – breast, endometrial). Characteristics of cancer cells (Hallmarks of Cancer): Sustained proliferative signaling, evading growth suppressors, resisting cell death (apoptosis), enabling replicative immortality (telomerase activation), inducing angiogenesis, activating invasion and metastasis, reprogramming energy metabolism (Warburg effect), evading immune destruction, tumor-promoting inflammation, genome instability. Tumor differentiation and grade: Well-differentiated (resembles normal tissue, low grade) → poorly differentiated (anaplasia – loss of differentiation, high grade). Anaplastic cells – pleomorphism, hyperchromatic nuclei, high nuclear-to-cytoplasmic ratio, atypical mitoses. Metastasis: Spread to distant sites via lymphatic vessels (lymph node metastases), blood vessels (hematogenous – liver, lung, bone, brain), or direct seeding (body cavities). Steps – invasion of ECM, intravasation, circulation, extravasation, colonization. Cancer staging (TNM system): T (tumor size and local invasion), N (lymph node involvement), M (distant metastasis). Stage 0 (in situ) to Stage IV (distant metastasis). Prognosis and treatment decisions based on stage. Paraneoplastic syndromes: Cancer-related symptoms not due to direct tumor invasion or metastasis. Examples – hypercalcemia (squamous cell lung cancer, breast cancer – PTHrP), SIADH (small cell lung cancer – hyponatremia), Cushing's syndrome (small cell lung cancer – ACTH), Lambert-Eaton syndrome (small cell lung cancer), digital clubbing (bronchogenic carcinoma), Trousseau syndrome (migratory thrombophlebitis – pancreatic, lung cancer). Tumor markers: Substances produced by tumors detectable in blood. Examples – PSA (prostate), CA-125 (ovarian), CEA (colorectal), AFP (liver), CA 19-9 (pancreatic), hCG (choriocarcinoma, testicular). Use for screening, monitoring response, detecting recurrence. Effects of cancer: Local effects (pain, obstruction, bleeding), systemic effects (cachexia – weight loss, muscle wasting; fatigue, anemia, immunosuppression, paraneoplastic syndromes). Cancer cachexia – cytokine-mediated (TNF-α, IL-6, IFN-γ), increased resting energy expenditure, anorexia. Each question includes a detailed rationale explaining the pathophysiologic mechanism, clinical correlation, and correct answer reasoning – ensuring you understand the "why" behind every correct choice. With fully verified Q&A plus rationales and our Pass Guarantee, this is the definitive tool to ace your Week 4 Quiz on the first attempt. Get instant access now a nd start studying today.