Excessive secretion of aldosterone causes which of the following responses?
Increased plasma potassium
Increased plasma sodium
Decreased plasma phosphorus
Decreased plasma calcium
The Correct Answer is B
A. Excessive aldosterone causes increased reabsorption of sodium and water, and the excretion of potassium. Therefore, excessive aldosterone would typically decrease plasma potassium levels, not increase them.
B. Aldosterone stimulates the kidneys to reabsorb sodium and excrete potassium, leading to increased plasma sodium levels. This is the correct effect of excessive aldosterone secretion.
C. Phosphorus levels are not directly affected by aldosterone; its primary role is in regulating sodium and potassium balance.
D. Aldosterone does not directly regulate calcium levels in the blood, so plasma calcium levels are not significantly affected by aldosterone secretion.
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Related Questions
Correct Answer is D
Explanation
A. The minor calyx collects urine from the renal papillae (tips of the renal pyramids), but it is not the structure immediately before the ureter. It connects to the major calyx.
B. Renal pyramids are structures within the kidney that contain the renal tubules and are involved in the filtration and excretion process. However, they do not directly connect to the ureter.
C. The major calyx is a larger collecting area formed by the union of several minor calyces. It channels urine into the renal pelvis but is not directly before the ureter.
D. The renal pelvis is the funnel-shaped structure that collects urine from the major calyces and funnels it into the ureter. It is the anatomical structure immediately before the ureter, which then carries urine to the bladder.
Correct Answer is D
Explanation
A. The transverse colon is where feces travels after the ascending colon, moving from right to left across the abdomen. Feces does not move directly from the cecum to the transverse colon.
B. The descending colon is the part of the colon that runs down the left side of the abdomen. Feces moves into this section after passing through the transverse colon, not directly after the cecum.
C. The sigmoid colon is the final section of the colon before the rectum. Feces travels here after the descending colon, not immediately after the cecum.
D. The ascending colon is the section of the colon that feces travels through immediately after the cecum. It moves upward on the right side of the abdomen before passing into the transverse colon.
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