If you radioactively labeled antidiuretic hormone (adh), where would you expect to find the radioactivity after the hormone had been allowed to circulate?

The correct answer will be- collecting tubules of kidney

Explanation:

Anit-diuretic hormone or ADH is a vasopressin hormone which leads to the decreased formation of urine. ADH is secreted by posterior pituitary region of the brain in the low concentration of water thus, ADH helps conserve the water in the body.

ADH once secreted from the brain binds the receptors present in the collecting tubules of the kidney where it shows its effect by adding aquaporins in the membrane which allows the reabsorption of water in the membrane.

Thus, collecting tubules of the kidney is the correct answer.

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