Identify the correct statement (s) regarding the human kidney
I. It is responsible for the storage of nutrients such as glycogen
II. It concentrates the urine by actively transporting water from the filtrate.
III. It produces more dilute urine, when the collecting ducts become less permeable to water.
IV. The kidney gets rid of urea from the body by secreting it into the descending arm of the loop of Henle.
V. It responds to antidiuretic hormone by increasing urine output
VI. It reponds to atrial natiutetic factor by decreasing urinary excretion
VII. Kidney functions are controlled by negative feedback circuits involving ADH, RAAS and ANF.

Options

A. II, IV and V
B. V and VI
C. I, IV and VI
D. III and VII

Answer

To solve the question regarding the correct statements about the human kidney, we will analyze each statement one by one:

### Step-by-Step Solution:

1. **Statement I: It is responsible for the storage of nutrients such as glycogen.**
- This statement is **incorrect**. The human kidney does not store glycogen; that function is primarily performed by the liver and muscle tissues.

2. **Statement II: It concentrates the urine by actively transporting water from the filtrate.**
- This statement is **incorrect**. The kidney concentrates urine by reabsorbing water from the filtrate, but it does so passively through osmosis, not by actively transporting water out.

3. **Statement III: It produces more dilute urine when the collecting ducts become less permeable to water.**
- This statement is **correct**. When the collecting ducts are less permeable to water, less water is reabsorbed, resulting in more dilute urine.

4. **Statement IV: The kidney gets rid of urea from the body by secreting it into the descending arm of the loop of Henle.**
- This statement is **incorrect**. Urea is primarily secreted into the proximal convoluted tubule, not the descending arm of the loop of Henle.

5. **Statement V: It responds to antidiuretic hormone by increasing urine output.**
- This statement is **incorrect**. Antidiuretic hormone (ADH) actually decreases urine output by promoting water reabsorption in the kidneys.

6. **Statement VI: It responds to atrial natriuretic factor by decreasing urinary excretion.**
- This statement is **incorrect**. Atrial natriuretic factor (ANF) promotes the excretion of sodium and water, thus increasing urinary output.

7. **Statement VII: Kidney functions are controlled by negative feedback circuits involving ADH, RAAS, and ANF.**
- This statement is **correct**. The kidney's functions are indeed regulated by negative feedback mechanisms involving these hormones.

### Conclusion:
The correct statements regarding the human kidney are **III and VII**.