Draw and label the nephron of a kidney. Include and label the following items in your drawing:
a. Afferent arteriole
- Distal convoluted tubule
b. Efferent arteriole
j. Collecting duct
c. Renal corpuscle
k. (3 pts) In your drawing, note the three regions in
d. Glomerular capsule
the nephron where H₂O is reabsorbed and label with arrows the direction of H₂O movement (assume ADH is present)
e. Glomerulus
f. Proximal convoluted tubule
I. In your drawing, note the region of the tubule that
g. Nephron loop, descending limb
h. Nephron loop, ascending limb (you do not need to include the thick or thin segments)
is permeable to Na’ only
The Correct Answer and Explanation is :
Here is the detailed anatomical illustration of a nephron in the kidney, labeled as per your specifications. It includes the key components like the afferent and efferent arterioles, renal corpuscle, glomerular capsule, proximal and distal convoluted tubules, nephron loop, and collecting duct. The regions where water is reabsorbed are indicated with arrows, assuming the presence of ADH. The region of the tubule permeable only to sodium (Na⁺) is also highlighted.
Feel free to take a closer look at the image for details!
For your question on the region of the tubule that is permeable only to sodium, the answer is the thick ascending limb of the nephron loop. This segment is impermeable to water but actively transports sodium (Na⁺) ions out of the tubular fluid. This transport is crucial for the countercurrent multiplication mechanism that allows the kidney to concentrate urine and control fluid balance in the body. By actively removing sodium from the tubular fluid, the thick ascending limb creates a concentration gradient that drives the reabsorption of water in the collecting ducts under the influence of ADH, hence helping in the regulation of water balance and sodium concentration in the body.
