Foundations of Medical Science: Cellular, Genetic, and Systemic Concepts

Notes

Pathology - Cellular Injury and Tumor Suppressors Anaplasia indicates poorly differentiated cells, suggesting high-grade malignancy. Mutations in tumor suppressor genes like p53 (inhibited by HPV E6) and Rb (inhibited by HPV E7) are key in cancer development. Metaloproteinases facilitate tumor invasion by degrading the basement membrane. Genetics and Syndromes Waardenburg syndrome results from neural crest cell migration failure, causing depigmentation and hearing loss. It manifests with patchy skin, iris heterochromia, and cochlear dysfunction. Physiology and Biochemistry GIP, secreted by duodenal K cells, decreases gastric acid and stimulates insulin, lowering serum glucose. PKU results from phenylalanine hydroxylase deficiency, impairing catecholamine synthesis; tyrosine supplementation bypasses this defect. Anatomy and Microbiology Pores of Kohn connect alveoli, enabling airflow and pathogen spread, explaining rapid lobar pneumonia. Fungal infections like coccidioidomycosis are endemic in the southwestern US. HIV encephalopathy features multinucleated giant cells, with MRI showing white matter lesions. Immunology and Oncology CD8+ T cells clear viruses during acute infection. M...