5:26 934 d2l.laurentian.ca Quiz 3 0:38:26 elapsed Which one of the following pairs of hormones are not antagonistic? a) aldosterone - ADH b) aldosterone - atrial natriuretic peptide c) PTH - calcitonin d) GHRH - somatostatin e) insulin - glucagon

To determine which pair of hormones are not antagonistic, let's first define what antagonistic hormones are. Antagonistic hormones are those that have opposing effects on the same physiological function. Now, let's analyze each pair: a) **Aldosterone - ADH (Antidiuretic Hormone)**: - Aldosterone promotes sodium retention and potassium excretion, leading to increased blood volume and pressure. - ADH promotes water retention in the kidneys, also increasing blood volume. - **These hormones are not antagonistic; they can work together to increase blood volume.** b) **Aldosterone - Atrial Natriuretic Peptide (ANP)**: - Aldosterone promotes sodium retention, while ANP promotes sodium excretion and lowers blood pressure. - **These hormones are antagonistic.** c) **PTH (Parathyroid Hormone) - Calcitonin**: - PTH increases blood calcium levels, while calcitonin decreases blood calcium levels. - **These hormones are antagonistic.** d) **GHRH (Growth Hormone-Releasing Hormone) - Somatostatin**: - GHRH stimulates the release of growth hormone, while somatostatin inhibits its release. - **These hormones are antagonistic.** e) **Insulin - Glucagon**: - Insulin lowers blood glucose levels, while glucagon raises blood glucose levels. - **These hormones are antagonistic.** Based on this analysis, the pair of hormones that are **not antagonistic** is: **a) aldosterone - ADH**.