5:08 854 d2I.laurentian.ca Quiz 3 0:20:24 elapsed The most important function of the juxtaglomerular (JG) apparatus is to a) produce chemicals that change the diameter of the loop of Henle b) secrete water and $$ \mathrm{Na}^{+} $$ into the tubular fluid c) produce antidiuretic hormone in response to an increased glomerular filteration rate (GFR) d) make sure that the diameter of the efferent arterioles is kept larger than those

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To solve the quiz question regarding the function of the juxtaglomerular (JG) apparatus, let's analyze each option provided:

a) **Produce chemicals that change the diameter of the loop of Henle**: This is not a primary function of the JG apparatus. The loop of Henle is primarily involved in the concentration of urine, but its diameter is not directly regulated by the JG apparatus.

b) **Secrete water and $$ \mathrm{Na}^{+} $$ into the tubular fluid**: The JG apparatus does not primarily secrete substances into the tubular fluid. Instead, it plays a role in regulating blood pressure and filtration rate.

c) **Produce antidiuretic hormone in response to an increased glomerular filtration rate (GFR)**: The JG apparatus does not produce antidiuretic hormone (ADH). ADH is produced by the hypothalamus and released by the posterior pituitary gland. The JG apparatus is involved in the regulation of blood pressure and GFR but does not produce ADH.

d) **Make sure that the diameter of the efferent arterioles is kept larger than those**: This statement is incomplete, but the JG apparatus does play a role in regulating the diameter of the afferent and efferent arterioles to control blood flow and pressure within the glomerulus.

Based on the analysis, the most accurate function of the juxtaglomerular apparatus is related to the regulation of blood pressure and glomerular filtration rate, particularly through the secretion of renin, which affects the diameter of the arterioles.

However, none of the options provided perfectly describe the primary function of the JG apparatus. If I had to choose the best option based on the context, I would lean towards option **d**, as it relates to the regulation of arteriolar diameter, even though the statement is incomplete.

Thus, the answer is likely **d)**, but it would be beneficial to clarify the complete statement for accuracy.
The juxtaglomerular apparatus primarily regulates blood pressure and glomerular filtration rate by controlling the diameter of the arterioles.

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