What is the meaning of the suffix "-tropin"?

The suffix "-tropin" is derived from the Greek word "tropos," which means "a turning" or "to stimulate." In a medical context, it refers to substances that stimulate the activity of specific organs or glands. This suffix is commonly used in the names of hormones that regulate various physiological processes by promoting the function or secretion of target cells. For instance, different tropins can influence growth, metabolism, or reproductive functions.

The other options do not capture the specific action of stimulation associated with "-tropin." While some may mention growth or development, they do not convey the direct stimulation aspect that the suffix emphasizes. This distinction is crucial in understanding how certain hormones function within the endocrine system.