What is the order of urine-collecting structures found within the kidney?
Minor calyx, major calyx, renal pelvis, ureter
Renal pelvis, major calyx, minor calyx, ureter
Ureter, major calyx, minor calyx, renal pelvis
Major calyx, minor calyx, ureter, renal pelvis
Minor calyx, major calyx, ureter, renal pelvis
The Correct Answer is A
A. Minor calyx, major calyx, renal pelvis, ureter: Urine drains from the renal papillae into the minor calyces, which converge to form larger major calyces. These empty into the funnel-like renal pelvis, the central collecting region of the kidney. The pelvis then narrows as it exits the hilum to become the ureter.
B. Renal pelvis, major calyx, minor calyx, ureter: This sequence reverses the actual flow of filtrate through the renal collecting system. Urine must move from the microscopic collecting ducts toward progressively larger macrostructures. It is anatomically impossible for fluid to flow from the pelvis back into the minor calyces.
C. Ureter, major calyx, minor calyx, renal pelvis: This order suggests a retrograde flow of urine from the external duct into the internal kidney structures. Under normal physiological conditions, gravity and peristalsis move urine away from the kidney toward the bladder. The ureter is the terminal structure in this anatomical list.
D. Major calyx, minor calyx, ureter, renal pelvis: This selection inaccurately places the major calyx before the minor calyx and misplaces the renal pelvis. The renal pelvis must precede the ureter as it is the immediate drainage site for all calyces. Minor calyces always serve as the initial receiving vessels for papillary filtrate.
E. Minor calyx, major calyx, ureter, renal pelvis: This sequence correctly identifies the start of the drainage path but incorrectly places the ureter before the renal pelvis. The renal pelvis is the anatomical bridge between the major calyces and the proximal ureter. Urine cannot reach the ureter without first passing through the pelvic reservoir.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is B
Explanation
A. chief cells; carbonic anhydrase (CAH); parietal cells: Chief cells correctly synthesize the zymogen pepsinogen, but carbonic anhydrase is an enzyme, not a direct activator. CAH facilitates the formation of protons within cells but does not catalyze extracellular protein cleavage. Pepsinogen requires a low pH environment for activation.
B. chief cells; hydrochloric acid (HCl); parietal cells: Gastric chief cells secrete inactive pepsinogen into the stomach lumen. Hydrochloric acid, produced by parietal cells via proton pumps, lowers the luminal pH to approximately 2. This acidic environment triggers the autocatalytic conversion of pepsinogen into the active protease pepsin.
C. parietal cells; hydrochloric acid (HCl): chief cells: This selection incorrectly reverses the cellular origins of the enzyme and the acid. Parietal cells are responsible for secreting hydrochloric acid and intrinsic factor, not the zymogen pepsinogen. Chief cells provide the protein substrate but do not produce the acid required.
D. parietal cells; carbonic anhydrase (CAH); chief cells: Carbonic anhydrase is an intracellular enzyme that provides the hydrogen ions for acid production. It is not the molecule that directly interacts with pepsinogen in the gastric lumen. Furthermore, parietal cells do not produce the pepsinogen zymogen required for this reaction.
E. enteroendocrine cells; carbonic anhydrase (CAH); parietal cells: Enteroendocrine cells, specifically G cells, secrete hormones like gastrin into the bloodstream rather than digestive zymogens. Carbonic anhydrase remains an intracellular catalyst for ion formation. This combination fails to describe the luminal activation of proteases necessary for protein degradation.
Correct Answer is A
Explanation
A. Kidneys: Antidiuretic hormone primarily targets the principal cells of the collecting ducts and distal convoluted tubules in the nephron. It triggers the insertion of aquaporin-2 water channels into the apical membrane, significantly increasing water reabsorption. This mechanism conserves body water and concentrates the urine to maintain osmolarity.
B. adrenal gland: While the adrenal gland is involved in fluid balance via aldosterone, it is not the primary target of ADH. ADH and aldosterone work through different mechanisms in different regions of the kidney. ADH does not stimulate the secretion of hormones from the adrenal cortex or medulla.
C. anterior pituitary: The anterior pituitary is part of the endocrine signaling cascade but does not serve as an effector organ for ADH. ADH is released from the posterior pituitary and bypasses the anterior lobe to reach its systemic targets. There are no significant ADH receptors located within the adenohypophysis.
D. hypothalamus: The hypothalamus serves as the site of ADH synthesis and contains the osmoreceptors that trigger its release. It acts as the control center rather than the downstream target organ. ADH is secreted into the blood to exert its physiological effects on distant peripheral tissues.
E. pancreas: The pancreas is responsible for regulating blood glucose through the secretion of insulin and glucagon. It does not play a direct role in the homeostatic regulation of water reabsorption or plasma osmolarity managed by ADH. There are no established physiological targets for ADH within the pancreatic tissue.
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