NR-283 Pathophysiology - Set 1 - Part 3

Correct Answer: Pneumocystis jirovecii within the alveoli

Pneumocystis pneumonia comes on insidiously with a nonproductive cough and hypoxia far worse than the chest findings suggest. It is the classic illness once helper cell numbers drop below two hundred. Option a is incorrect because thrush produces white curd like plaques and soreness in the mouth rather than dyspnea. Esophageal spread causes painful swallowing, and neither form explains falling saturation during a short walk. Option c is incorrect because reactivated tuberculosis usually brings a productive cough, hemoptysis, drenching night sweats and weight loss, with cavities visible in the upper lobes. The dry cough and clear chest point elsewhere. Option d is incorrect because cryptococcal disease in advanced HIV settles in the meninges, producing a subacute headache, fever and neck discomfort. Nothing about that infection lowers oxygen saturation while the client is walking.

Correct Answer: Xenograft for the valve, autograft for the vein

Tissue taken from another species is a xenograft, so the porcine valve qualifies. Moving a vessel from one site to another in the same person is an autograft and carries no rejection risk. Option b is incorrect because an allograft comes from another human being, which a pig valve is not. Isograft is reserved for tissue exchanged between identical twins, and no twin appears in this scenario. Option c is incorrect because both labels are reversed and misapplied. Genetically identical donors define an isograft, and human to human transfer defines an allograft, yet neither describes a valve from a pig. Option d is incorrect because self donated tissue cannot be the valve; the client did not grow a porcine valve. Naming the leg vein a cross species graft reverses the only two terms that fit.

Correct Answer: The C reactive protein

C reactive protein climbs within four to six hours of an inflammatory insult and falls quickly because its half life is about a day. That speed makes it the marker for day to day tracking. Option a is incorrect because sedimentation rate takes a day or two to rise and then declines over weeks. Its sluggish curve suits chronic disease monitoring but will not show a change after only two days of therapy. Option b is incorrect because albumin is a negative acute phase reactant that drops during illness and recovers slowly. Reading it as a treatment response marker also confuses inflammation with nutritional status. Option d is incorrect because fibrinogen rises later than the faster reactants and its main clinical value lies in coagulation and in driving the sedimentation rate. Serial measurement would lag behind this client's course.

Correct Answer: Pulmonary tuberculosis with caseous necrosis

Caseous necrosis is the signature of tuberculosis, forming at the middle of a granuloma where macrophages and lymphocytes wall off the organism. The cheesy material destroys all tissue architecture. Option a is incorrect because pancreatic enzyme release breaks fat into fatty acids that bind calcium, leaving chalky white plaques in the abdomen. That process does not occur inside a pulmonary granuloma. Option b is incorrect because an abscess liquefies into frank pus, a thin creamy fluid rather than a dry crumbly mass. Its wall is also inflammatory tissue, not an organized granuloma. Option c is incorrect because severely elevated pressure deposits bright pink fibrin and immune complexes within arteriolar walls. Vessels, not airspaces, carry that change, and cough with night sweats points elsewhere.

Correct Answer: Plasma membranes ruptured in the first client

Intracellular proteins reach the blood only when the plasma membrane gives way, which is the defining event of irreversible injury. Undetectable troponin means those membranes are still holding in the second client. Option a is incorrect because swelling alone keeps every marker protein locked inside the cell, which is why the second client's result is blank. A rising level in the first client contradicts that reading. Option c is incorrect because the direction of the evidence is reversed here. Absent enzyme leak points to cells whose membranes have held, so that client has the smaller burden of dead tissue. Option d is incorrect because programmed death packages cell contents into sealed fragments that macrophages swallow whole. Nothing escapes into serum, so this quiet pathway never produces the enzyme elevations seen after infarction.

Correct Answer: Vector borne spread by an arthropod

A living carrier such as a tick, mosquito or flea moves the organism from one host to the next. Rickettsia rickettsii enters during the bite and attacks vessel walls, producing the peripheral rash. Option b is incorrect because a vehicle is a shared nonliving medium like food, water, blood products or intravenous fluid that carries organisms to many people at once. No such common source appears here. Option c is incorrect because fomite spread needs a contaminated inanimate object, a bed rail, stethoscope or doorknob, to hand the organism along. The tick is alive and carries the organism itself. Option d is incorrect because droplet spread requires respiratory particles from a coughing person landing on nearby mucous membranes. This illness came through the skin at a bite site, with no human source involved.

Correct Answer: Neutrophils actively phagocytosing bacteria

Neutrophils are the first responders, reaching an injury within minutes to hours and peaking near the first day. Their short life and heavy phagocytic activity make them the signature cell of acute inflammation. Option a is incorrect because plasma cells are differentiated B lymphocytes that show up late and mark a shift toward specific immunity. Their presence in tissue suggests inflammation that has persisted for weeks. Option b is incorrect because eosinophil recruitment signals a parasitic worm or an allergic reaction rather than a fresh cut. A clean traumatic wound gives no stimulus for interleukin five or eotaxin release. Option d is incorrect because granulomas take weeks to organize and appear only when the body cannot clear an agent. Finding walled off aggregates of activated macrophages six hours after trauma would be impossible.

Correct Answer: Secondary intention with abundant granulation

Secondary intention describes a wound whose edges cannot be brought together, so it fills with granulation tissue from the base and contracts inward. Healing is slow and the resulting scar is large. Option a is incorrect because primary intention requires clean edges held together by sutures, staples or adhesive with minimal tissue loss. A crater on the sacrum has no edges close enough to approximate. Option b is incorrect because tertiary healing means a wound deliberately held open for a few days and then closed in the operating room. No delayed closure is planned for this pressure injury. Option c is incorrect because resolution happens only when damage is trivial and the injured cells simply recover, as after a mild sunburn. Extensive tissue loss guarantees that connective tissue must fill the defect.

Correct Answer: Atrophy from prolonged disuse of the muscle

Disuse lowers workload, so muscle cells digest their own organelles by autophagy and shrink. Cell size falls, the limb mass drops, and strength returns with rehabilitation once loading resumes. Option b is incorrect because hypertrophy enlarges individual cells in response to greater workload, which is the opposite of what an immobilized limb experiences. A casted thigh carries no load, so its fibers shrink rather than build. Option c is incorrect because hyperplasia raises cell number and needs tissues capable of mitosis. Skeletal muscle fibers are permanent cells that cannot divide, and losing nerve or load input never multiplies them. Option d is incorrect because metaplasia swaps one mature cell type for another under chronic irritation, typically in epithelium. Nothing about a cast changes muscle into a different tissue; the fibers simply become smaller.

Correct Answer: Type one degranulation triggered by IgE cross linking

Pollen cross links IgE already sitting on nasal mast cells, and the cells release histamine within minutes. Vasodilation, mucus production and itching follow, producing the classic picture of allergic rhinitis. Option a is incorrect because cytotoxic reactions use IgG or IgM aimed at antigen fixed on a particular cell, then destroy that cell. A transfusion reaction fits that description, whereas seasonal sneezing does not. Option c is incorrect because immune complexes form with soluble antigen in blood and lodge in kidneys, joints and vessel walls. That pattern brings fever and multi organ inflammation rather than isolated nasal symptoms. Option d is incorrect because delayed reactions need one to three days to appear and involve no antibody whatsoever. Symptoms arriving minutes after pollen exposure point away from a T cell process.