Which of the following describes the renal pelvis?
The outer tissue layer consisting of renal corpuscles and convoluted tubules
The inner tissue layer consisting of the loop of Henle and collecting tubules
The expanded area of a renal tubule that encloses the glomerulus
The cavity where urine flows from the calyces to enter the ureters
The Correct Answer is D
a. The outer tissue layer consisting of renal corpuscles and convoluted tubules: This describes the renal cortex, not the renal pelvis.
b. The inner tissue layer consisting of the loop of Henle and collecting tubules: This describes the renal medulla, not the renal pelvis.
c. The expanded area of a renal tubule that encloses the glomerulus: This describes Bowman's capsule, not the renal pelvis.
d. The cavity where urine flows from the calyces to enter the ureters: Correct. The renal pelvis is the funnel-shaped cavity that collects urine from the calyces and channels it into the ureter.
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Related Questions
Correct Answer is D
Explanation
a. Ureters are connected inside the urinary bladder by a two-way valve: The ureters connect to the urinary bladder through openings that act as one-way valves to prevent urine from flowing back into the ureters.
b. Ureters are fibrotic tubes connecting the kidneys to the urinary bladder: Ureters are not fibrotic; they are muscular tubes lined with a mucous membrane that propels urine from the kidneys to the bladder.
c. Ureters are covered by an outer layer of epithelial tissue: The outermost layer of the ureters is actually composed of connective tissue (adventitia), not epithelial tissue.
d. Ureters are extraperitoneal tubular structures: This is correct. Ureters are located outside the peritoneal cavity.
Correct Answer is A
Explanation
a. Exchanging of gas: Alveoli are the primary sites for gas exchange in the lungs, where oxygen is absorbed into the blood and carbon dioxide is expelled.
b. Removing pathogens that are breathed in: This is a function of the respiratory tract's immune components, like macrophages in the alveoli, but not the primary function.
c. Containing mucus-producing goblet cells: Goblet cells are found in the respiratory tract but not in the alveoli.
d. Secreting surfactant to reduce surface tension: Alveolar cells do secrete surfactant, which is crucial for reducing surface tension and preventing alveolar collapse, but the primary function is gas exchange.
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