Exam 7: Histology

The pancreas of a 22-year-old Caucasian male with recurrent pulmonary infections and finger clubbing shows extensive exocrine gland atrophy and fibrosis.  The pancreatic ducts are lined with squamous epithelium with areas of keratinization.  The finding of squamous metaplasia in the pancreatic ducts is most likely related to a deficiency of:

A 3-year-old girl is brought to her pediatrician for a well child checkup.  She has met all of the appropriate developmental milestones.  Her height corresponds to the 60^th percentile.  Osteoblasts near the growth plates of her long bones secrete matrix material, and when they become trapped in the ossified matrix, they become known as osteocytes.  These osteocytes remain connected to each other by:

A researcher is looking at the elements that influence adrenal hormone production and release. A donor cadaver's intact adrenal gland is acquired, and a histologic slice across the complete gland is shown below. Cells are collected from a specific region of the gland, indicated by the arrow, for further examination. These cells are most likely to be directly activated by which of the following substances?

A 64-year-old man is brought to the emergency department due to worsening shortness of breath.  The patient is able to speak in short sentences only and becomes hypoxemic with minimal exertion.  His medical history includes hypertension and dyslipidemia.  He smoked a pack of cigarettes a day for 40 years and worked for 25 years as a nickel miner.  His father died of chronic respiratory failure.  While in the emergency department, he rapidly develops respiratory failure and is intubated.  Despite appropriate treatment, he dies several days later in the intensive care unit.  Autopsy is performed, and examination of the bronchi reveals thickened bronchial walls, inflammatory infiltrates, mucous gland enlargement, and patchy squamous metaplasia of the bronchial mucosa.  Which of the following factors was likely the greatest contributor to this patient's pathological findings?

A 23-year-old woman comes to the physician for a routine health maintenance examination. She feels well. Menses have occurred at regular 30-day intervals and last for 5 days with normal flow. She has a history of gonorrhea that was treated at 20 years of age. She has smoked one pack of cigarettes daily for 3 years. She drinks one glass of wine daily. Her only medication is an oral contraceptive. Vital signs are within normal limits. Physical examination including pelvic examination shows no abnormalities. A Pap smear shows high-grade cervical intraepithelial neoplasia.  Which of the following is the most likely finding on histopathology?

A 17-year-old kid arrives at the clinic with a facial lesion. Several weeks ago, the patient discovered a little spot of rough skin on his lower lip, which has gradually expanded. He says he feels no discomfort or itching. The patient suffered from eczema as a youngster but has no other chronic medical issues. The vital indicators are within normal ranges. The presentation depicts the results of the physical examination. There are no other skin rashes, oral lesions, or enlarged lymph nodes.  Which of the following histopathological findings are most likely present in this patient's skin lesion?