Which of the following has an abundance of lymphoid tissue in the mucosa and submucosa?
Small intestine
Stomach
Large intestine
Esophagus
The Correct Answer is A
A. Small intestine, particularly the ileum, contains Peyer's patches, which are abundant lymphoid tissues in the mucosa and submucosa. These structures are part of the immune system, protecting the body from pathogens in the digestive tract.
B. Stomach: While the stomach has some lymphoid tissue, it does not have as much as the small intestine, specifically the Peyer's patches.
C. Large intestine has lymphoid nodules, but it does not contain as much lymphoid tissue as the small intestine.
D. Esophagus has very little lymphoid tissue compared to the small intestine, as its primary function is to transport food rather than participate in immune defense.
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Correct Answer is B
Explanation
A. Pyelitis is an infection of the renal pelvis and does not cause sweet-smelling urine.
B. Diabetes mellitus often causes glycosuria (glucose in urine), which can make urine taste sweet.
C. Renal calculus (kidney stones) does not affect urine sweetness.
D. Acute glomerulonephritis affects kidney function and urine appearance but does not specifically cause sweet-smelling urine.
Correct Answer is C
Explanation
A. Triglycerides are a type of fat found in the blood, but they are not classified as "bad cholesterol."
B. High-density lipoproteins (HDL) is known as "good cholesterol" because it helps remove cholesterol from the arteries.
C. Low-density lipoproteins (LDL) are referred to as "bad cholesterol" because high levels of LDL can lead to the build-up of plaque in arteries, increasing the risk of heart disease and stroke.
D. Chylomicrons are lipoproteins that transport dietary lipids from the intestines to other locations in the body. They are not classified as "bad cholesterol."