Which structures other than the skin are considered to be the “first line” of defense in humans?

Macrophages, lymph, and cytokines.

Lung epithelium, gastric mucosa, and tears.

Interferon, T cells, and neutrophils.

Thymus gland, bone marrow, and pancreas.

Answer and Explanation

The Correct Answer is B

Choice A reason: Macrophages, lymph, and cytokines are part of the innate immune response, acting after pathogens breach initial barriers. First-line defenses are physical and chemical barriers like mucosa and secretions, not immune cells or fluids. This choice represents secondary defenses, making it incorrect for the primary barrier role.

Choice B reason: Lung epithelium, gastric mucosa, and tears are first-line defenses, preventing pathogen entry. Lung cilia trap microbes, gastric acid kills bacteria, and tears’ lysozymes neutralize pathogens. These physical and chemical barriers form the body’s initial protection, aligning with immunology principles for primary defense against infection.

Choice C reason: Interferon, T cells, and neutrophils are part of adaptive and innate immunity, activated after pathogen penetration. First-line defenses involve barriers like mucosa, not immune mediators or cells. This choice describes secondary immune responses, making it incorrect for the initial protective structures in humans.

Choice D reason: Thymus, bone marrow, and pancreas are involved in immune cell production and metabolism, not direct pathogen defense. First-line defenses are external barriers like lung epithelium or tears. These internal organs support immunity but are not primary barriers, making this incorrect for first-line defense structures.

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Correct Answer is D

Explanation

Choice A reason: Artificial sweeteners do not directly contribute to diabetic nephropathy. Nephropathy results from chronic hyperglycemia damaging glomerular vessels. Sweeteners may affect diet but lack evidence linking them to renal damage, making this incorrect compared to elevated HbA1c, the primary driver of diabetic complications.

Choice B reason: Frequent hypoglycemia may cause acute symptoms but does not directly cause nephropathy. Chronic hyperglycemia, reflected by high HbA1c, damages renal glomeruli, leading to nephropathy. Hypoglycemia is a treatment complication, not a risk factor for renal damage, making this an incorrect choice.

Choice C reason: Moderate alcohol consumption may affect overall health but is not a primary risk factor for diabetic nephropathy. Chronic hyperglycemia, indicated by elevated HbA1c, drives glomerular damage. Alcohol’s impact is less direct, making this incorrect compared to the established link between poor glycemic control and nephropathy.

Choice D reason: Consistently elevated HbA1c reflects chronic hyperglycemia, the primary cause of diabetic nephropathy. High glucose levels damage glomerular capillaries, leading to proteinuria and renal decline. This is a well-established risk factor, supported by endocrinology evidence, making it the correct choice for increased nephropathy risk.

A. Tissue ischemia due to acute vasospasm. B. Destruction of norepinephrine receptors. C. Progressive scarring of the myelin sheath. D. Over-secretion of excitatory neurotransmitters.

Correct Answer is C

Explanation

Choice A reason: Tissue ischemia from vasospasm is associated with conditions like stroke, not multiple sclerosis (MS). MS involves immune-mediated demyelination of the central nervous system, causing exacerbations. Ischemia does not drive MS exacerbations, making this incorrect, as scarring of the myelin sheath is the hallmark pathological change.

Choice B reason: Destruction of norepinephrine receptors is unrelated to multiple sclerosis. MS exacerbations result from immune attacks on myelin, leading to scarred plaques that disrupt nerve conduction. Norepinephrine receptor issues may affect autonomic functions, but they are not part of MS’s pathophysiology, making this an incorrect choice.

Choice C reason: Multiple sclerosis exacerbations result from immune-mediated destruction and scarring (sclerosis) of the myelin sheath, forming plaques that impair nerve signal transmission. This causes neurological symptoms like weakness or sensory loss. Progressive demyelination and scarring are the core pathologic changes, aligning with MS’s clinical and histopathological features.

Choice D reason: Over-secretion of excitatory neurotransmitters may occur in epilepsy or neurotoxicity, not multiple sclerosis. MS exacerbations stem from myelin sheath scarring, disrupting nerve conduction, not neurotransmitter imbalances. This choice is incorrect, as it does not reflect the immune-driven demyelination central to MS’s pathological process.

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Which structures other than the skin are considered to be the “first line” of defense in humans?

Nursing Test Bank

Naxlex Comprehensive Predictor Exams

Which factor in the history of a client with diabetes mellitus increases the client’s risk for nephropathy?

Correct Answer is D

Explanation

In caring for a client with exacerbations of multiple sclerosis, the nurse recognizes that the exacerbations result in which pathologic change?

Correct Answer is C

Explanation

A female client with rheumatoid arthritis (RA) comes to the clinic with swelling of her wrists after she braced herself against a fall in the bathroom. Which pathophysiological mechanism should the nurse explain to the client regarding RA?

The nurse should recognize which response is the immune system’s reaction to a source of inflammation?

An older adult client with type 2 diabetes mellitus presents to the emergency department (ED) with a respiratory infection. The nurse recognizes that the client is at risk for hyperosmolar hyperglycemic state (HHS) as a result of which process?

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The nurse is caring for an older adult client with heart failure (HF) and multiple comorbidities. Which finding(s) in the client’s history are consistent with the client developing HF? (Select all that apply)

The nurse is caring for a client with diverticulitis who presents with fever and acute lower left quadrant abdominal pain. Which pathophysiologic mechanism supports the client’s clinical presentation?

When developing a teaching plan for a client with peripheral artery disease (PAD), the nurse should explain that intermittent claudication occurs as the result of which underlying pathophysiology?