Sum26 Day 2 Final Exam - Lincoln Memorial University - College of Veterinary Medicine
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Free Sum26 Day 2 Final Exam - Lincoln Memorial University - College of Veterinary Medicine Questions
What immune component activated by antibodies leads to opsonization and phagocytosis of invasive bacteria?
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Cytokines
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T cells
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Gamma interferon
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Complement
Explanation
Explanation:
Correct Answer: (D) Complement. Antibodies bound to bacterial surfaces activate the complement cascade, which coats (opsonizes) the bacteria and marks them for destruction by phagocytic cells.
Why Other Options are Incorrect:
A. Cytokines — These are signaling proteins that regulate immune cell communication and activity, but they are not the component activated directly by antibody binding to trigger opsonization.
B. T cells — T cells are involved in cell-mediated immunity and helping antibody production, but they do not carry out opsonization themselves.
C. Gamma interferon — This cytokine activates macrophages and enhances immune responses, but it is not the antibody-triggered system responsible for opsonization.
Two dogs receive the same dose of a highly protein-bound antimicrobial. Dog A has normal plasma albumin concentrations. Dog B has severe hypoalbuminemia. Which change is MOST likely in Dog B?
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Reduced tissue penetration because more drug remains protein-bound
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Reduced volume of distribution because less drug enters tissues
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Increased free drug concentrations may increase both tissue exposure and toxicity.
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Reduced oral bioavailability because less protein is available
Explanation
Explanation:
Correct Answer: (C) Increased free drug concentrations may increase both tissue exposure and toxicity. With severe hypoalbuminemia, there is less albumin available to bind the highly protein-bound drug, resulting in a higher fraction of free (unbound) drug in circulation, which increases both tissue exposure and the risk of toxicity. Why Other Options are Incorrect:
A. Reduced tissue penetration because more drug remains protein-bound Hypoalbuminemia results in less, not more, drug remaining protein-bound, since there is less albumin available for binding.
B. Reduced volume of distribution because less drug enters tissues With more free drug available due to reduced protein binding, more drug is able to distribute into tissues, increasing rather than decreasing the volume of distribution.
D. Reduced oral bioavailability because less protein is available Plasma protein binding relates to drug distribution in the bloodstream, not to the absorption process that determines oral bioavailability.
Which fluid profile is most consistent with an exudate?
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Low protein concentration and high nucleated cell count
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High protein concentration and low nucleated cell count
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High protein concentration and high nucleated cell count
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Low protein concentration and low nucleated cell count
Explanation
Explanation:
Correct Answer: (C) High protein concentration and high nucleated cell count An exudate forms due to increased vascular permeability during inflammation, resulting in fluid that is rich in both protein and inflammatory cells, producing a high protein concentration along with a high nucleated cell count. Why Other Options are Incorrect:
A. Low protein concentration and high nucleated cell count Exudates are characterized by high, not low, protein concentration, since increased vascular permeability allows protein leakage along with cells.
B. High protein concentration and low nucleated cell count While the high protein concentration fits an exudate, a low nucleated cell count is more typical of a transudate, not an inflammatory exudate.
D. Low protein concentration and low nucleated cell count This profile describes a transudate, which results from hydrostatic or oncotic pressure imbalances rather than inflammation, unlike an exudate.
Which statement best describes epitope spreading?
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Mast cells release mediators immediately after allergen exposure
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Tissue damage exposes new self-antigens, expanding the autoimmune response
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Antibodies pass from one animal to another
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A microbial antigen resembles one host antigen
Explanation
Explanation:
Correct Answer: (B) Tissue damage exposes new self-antigens, expanding the autoimmune response Epitope spreading occurs when ongoing tissue damage (from an initial immune response) exposes previously hidden or new self-antigens, which the immune system then also targets, broadening and perpetuating the autoimmune reaction over time.
Why Other Options are Incorrect:
A. Mast cells release mediators immediately after allergen exposure — This describes an immediate (Type I) hypersensitivity reaction, not epitope spreading.
C. Antibodies pass from one animal to another — This describes passive immunity transfer, unrelated to epitope spreading.
D. A microbial antigen resembles one host antigen — This describes molecular mimicry, a different mechanism of triggering autoimmunity, not epitope spreading.
Which vaccine component is the active ingredient intended to stimulate the desired adaptive immune response?
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Antigen or Immunogen
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Preservative
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Adjuvant
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Stabilizer
Explanation
Explanation:
Correct Answer: (A) Antigen or Immunogen The antigen (immunogen) is the specific component of the vaccine that is recognized by the immune system and stimulates the targeted adaptive immune response (antibody and/or cell-mediated immunity) against the pathogen it represents.
Why Other Options are Incorrect:
B. Preservative — Preservatives maintain vaccine stability and prevent microbial contamination; they do not stimulate immunity.
C. Adjuvant — Adjuvants enhance or boost the immune response to the antigen but are not themselves the target of the immune response.
D. Stabilizer — Stabilizers protect the vaccine's integrity during storage and handling; they play no role in stimulating immunity.
A young horse has reduced elastic tissue and smooth muscle within the wall of a large artery near the heart. Which functional consequence would most directly result from this structural abnormality?
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Reduced ability to exchange nutrients across the vessel wall
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Reduced ability to absorb and dampen pulsatile pressure
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Reduced ability to prevent backward flow toward the heart
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Reduced ability to return interstitial fluid to the circulation
Explanation
Explanation:
Correct Answer: (B) Reduced ability to absorb and dampen pulsatile pressure Large arteries near the heart rely on elastic tissue and smooth muscle within their walls to absorb the pulsatile pressure generated by each heartbeat and convert it into steadier blood flow; reduced elastic tissue impairs this dampening function. Why Other Options are Incorrect:
A. Reduced ability to exchange nutrients across the vessel wall Nutrient exchange occurs primarily at the capillary level, not in large elastic arteries, so this function would not be directly affected.
C. Reduced ability to prevent backward flow toward the heart Preventing backward flow is primarily the function of venous and cardiac valves, not the elastic wall structure of large arteries.
D. Reduced ability to return interstitial fluid to the circulation Returning interstitial fluid to circulation is a function of the lymphatic system, not the elastic and muscular components of arterial walls.
Which of the following statements about sheep and goats is correct?
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One of the production purposes of goats is to assist on hikes with packing
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The most common health concern in these animals is internal parasites
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Urinary calculi cannot be linked with Calcium:Phosphate imbalance in male buck/Rams
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Sheep and Does are non-seasonal (yearlong) polyestrous breeders
Explanation
Explanation:
Correct Answer: (B) The most common health concern in these animals is internal parasites Internal parasitism (particularly gastrointestinal nematodes like Haemonchus contortus) is widely recognized as the most significant and common health challenge in small ruminant production, causing anemia, weight loss, and death if unmanaged.
Why Other Options are Incorrect:
A. One of the production purposes of goats is to assist on hikes with packing — While pack goats exist, this is a niche/recreational use, not a defining production purpose compared to meat, milk, and fiber.
C. Urinary calculi cannot be linked with Calcium:Phosphate imbalance in male buck/Rams — This is false; an improper Ca:P ratio is a well-established risk factor for urinary calculi in male small ruminants.
D. Sheep and Does are non-seasonal (yearlong) polyestrous breeders — Sheep and goats are generally seasonal breeders (short-day breeders), not yearlong polyestrous.
A dog begins a once-daily NSAID regimen for chronic osteoarthritis. After two doses, the owner reports minimal improvement and asks whether the dose should be increased. The patient is tolerating treatment without adverse effects. Which explanation BEST accounts for the limited clinical response?
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Reduced receptor sensitivity indicates that a more potent NSAID should be selected.
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The maintenance dose should be increased whenever a clinical response is not observed within 48 hours.
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The lack of clinical improvement indicates that the drug has failed pharmacodynamically.
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Several half-lives are generally required before steady-state concentrations are achieved and maximum drug accumulation occurs.
Explanation
Explanation:
Correct Answer: (D) Several half-lives are generally required before steady-state concentrations are achieved and maximum drug accumulation occurs. With once-daily dosing, it typically takes about 4–5 half-lives to reach steady-state plasma concentrations. After only two doses, the drug has likely not yet accumulated to its full therapeutic concentration, so minimal improvement at this point is expected rather than indicative of drug failure.
Why Other Options are Incorrect:
A. Reduced receptor sensitivity indicates that a more potent NSAID should be selected — There is no evidence of reduced receptor sensitivity; the issue is simply insufficient time to reach steady state.
B. The maintenance dose should be increased whenever a clinical response is not observed within 48 hours — Increasing the dose this early risks toxicity before steady state is even reached and is not appropriate.
C. The lack of clinical improvement indicates that the drug has failed pharmacodynamically — It is premature to conclude pharmacodynamic failure before steady-state concentrations have even been achieved.
What is the primary function of regulatory T (Treg) cells?
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Produce antibodies
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Present antigen to naïve T cells
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Kill virus-infected cells
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Suppress excessive or inappropriate immune responses
Explanation
Explanation:
Correct Answer: (D) Suppress excessive or inappropriate immune responses Regulatory T cells function to control and limit immune activity, preventing excessive or inappropriate responses that could lead to autoimmunity or tissue damage.
Why Other Options are Incorrect:
A. Produce antibodies Antibody production is carried out by B cells and plasma cells, not regulatory T cells.
B. Present antigen to naïve T cells Antigen presentation to naïve T cells is performed by antigen-presenting cells like dendritic cells, not Treg cells.
C. Kill virus-infected cells Killing virus-infected cells is the role of cytotoxic T cells, not regulatory T cells, whose main function is immune suppression rather than direct cytotoxicity.
A companion animal clinic is integrating an AI-based diagnostic tool to analyze thoracic radiographs. To ensure the judicious and responsible use of this technology, which of the following workflows represents the most appropriate application of AI in clinical practice?
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Allowing veterinary technicians to prescribe medications based solely on AI-detected abnormalities to streamline clinic efficiency.
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Treating the AI analysis as a supportive second opinion while requiring a veterinarian to independently interpret the images and make final treatment decisions.
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Automatically emailing the AI-generated radiology report directly to the pet owner to save staff communication time.
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Using the AI output as an absolute diagnostic truth, eliminating the need for a veterinarian to look at the images if the AI finds no abnormalities.
Explanation
Explanation:
Correct Answer: (B) Treating the AI analysis as a supportive second opinion while requiring a veterinarian to independently interpret the images and make final treatment decisions. Responsible use of AI diagnostic tools involves using them as a supplementary aid that supports, but does not replace, professional clinical judgment; the veterinarian must always independently review the images and retain ultimate responsibility for diagnosis and treatment decisions.
Why Other Options are Incorrect:
A. Allowing veterinary technicians to prescribe medications based solely on AI-detected abnormalities to streamline clinic efficiency. Prescribing medication is outside the scope of veterinary technicians' authority and should never be based solely on AI output without veterinarian oversight.
C. Automatically emailing the AI-generated radiology report directly to the pet owner to save staff communication time. AI-generated reports should be reviewed and interpreted by a veterinarian before any communication with clients, to ensure accuracy and appropriate context.
D. Using the AI output as an absolute diagnostic truth, eliminating the need for a veterinarian to look at the images if the AI finds no abnormalities. AI tools are not infallible and can miss abnormalities; a veterinarian must always review the images directly rather than relying solely on the AI's negative findings.
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