Peyer's patches, which house lymphocytes, are found in the
Esophagus
Stomach
Distal ileum
Jejunum
The Correct Answer is C
A. Esophagus: The esophageal mucosa consists of stratified squamous epithelium designed for protection against mechanical abrasion. It contains mucous glands but lacks organized lymphoid aggregates like Peyer's patches. It does not have a specialized immune role in the bowel.
B. Stomach: The gastric environment is highly acidic, which provides a non-specific barrier against pathogens. While it contains some diffuse lymphoid tissue, it does not possess the organized nodular Peyer's patches. These are absent in the proximal upper gastrointestinal tract.
C. Distal ileum: This region of the small intestine contains large, visible clusters of lymphatic nodules within the lamina propria and submucosa. These Peyer's patches are critical for immunosurveillance of the intestinal microbiome. They are the hallmark histological feature of the ileum.
D. Jejunum: Although the jejunum has diffuse lymphoid tissue, Peyer's patches are generally absent or extremely rare in this segment. The jejunum is primarily specialized for nutrient absorption rather than immune aggregation. Its histology is characterized by long villi instead.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is C
Explanation
A. Variable:While the pH of the gastrointestinal tract changes between segments, the specific secretion of the intestinal crypts is consistently maintained. It does not fluctuate randomly under normal physiological conditions. It remains within a specific alkaline range.
B. Neutral:A pH of 7.0 would not provide the necessary buffering capacity against the highly acidic chyme arriving from the stomach. Intestinal juice must be slightly higher than neutral. This alkalinity is essential for neutralizing gastric protons.
C. Basic:Intestinal juice typically has a pH ranging from 7.4 to 7.8 due to its high bicarbonate content. This alkaline fluid protects the duodenal mucosa from acid-induced injury. It creates the optimal environment for pancreatic enzyme activity.
D. Acidic:An acidic secretion would exacerbate the low pH of the incoming gastric chyme. The intestinal mucosa is not designed to withstand prolonged acid exposure without neutralization. Acidic secretions are characteristic of the stomach, not the crypts.
Correct Answer is B
Explanation
A. A person drinks a lot of water quickly:Rapid water ingestion does not typically stimulate excessive salivation beyond what is needed for swallowing. The salivary glands respond more to gustatory and olfactory stimuli than to volume. Hydration status remains the primary regulator here.
B. A person sees delicious food but cannot eat it:Visual and olfactory stimuli activate the parasympathetic nervous system via the salivary nuclei in the medulla. This causes a significant increase in watery, enzyme-rich saliva in anticipation of mastication. This is the classic cephalic response.
C. A person is experiencing dehydration:Dehydration triggers the sympathetic nervous system to reduce salivary secretion to conserve body water. This results in xerostomia, or a dry mouth, rather than overproduction. It is a protective mechanism against fluid loss.
D. A person is giving a public speech:Stress and anxiety associated with public speaking activate the sympathetic "fight or flight" response. This leads to the production of thick, mucus-rich saliva and a dry sensation. It does not cause excessive watery drooling.
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