The slide below is a stained thin section of a human trachea…

The slide below is a stained thin section of a human trachea containing the mucociliary escalator.  Which cell produces mucous? Image description: Stained tracheal tissue section. A points to small bright pink spheres at the top of the tissue. B points to large purple circular cells in the top layer of the tissue. C points to the small hair-like structures at the top of the tissue. D points to large pink cells deeper in the tissue.  

Ms. Rodriguez, a 27-year-old woman, presents to the outpatie…

Ms. Rodriguez, a 27-year-old woman, presents to the outpatient clinic with fatigue, pallor, and frequent nosebleeds. She reports a history of heavy menstrual periods and that her brother and maternal uncle both had “bleeding problems.” On examination, she is pale and has several small bruises on her arms and legs. Her vital signs are stable. Labs: Hemoglobin: 8.5 g/dL (12–16) Hematocrit: 26% (36–46) Platelets: 140,000/μL (150,000–400,000) WBC: 6,800/μL (4,000–11,000) PT: 21 sec (11–15) aPTT: 78 sec (25–40) **Family testing previously revealed her brother had Hemophilia A.   Which genetic characteristic applies to Hemophilia A, as seen in Ms. Rodriguez’s family?