Here's why:
* Steroid hormones are a class of lipids derived from cholesterol. They are characterized by their four fused ring structure.
* Cholesterol is a vital component of cell membranes and is also the precursor to steroid hormones.
* Examples of steroid hormones include:
* Sex hormones: Testosterone, estrogen, progesterone
* Adrenal hormones: Cortisol, aldosterone
While other types of lipids are important for various bodily functions, only steroids are directly used in the synthesis of hormones.