Final answer:
Substrates in the synthesis of steroids pass through the endoplasmic reticulum, mitochondria, and Golgi apparatus, the organs responsible for lipid synthesis, hormone creation, and packaging respectively.
Step-by-step explanation:
During steroid synthesis, substrates move through the endoplasmic reticulum, Golgi apparatus, and mitochondria. In the process of producing steroid hormones, the smooth endoplasmic reticulum synthesizes lipids including cholesterol, which is a precursor for steroid hormones. This is then further processed in the mitochondria, where steroidogenesis begins. The resulting steroid hormones may be further modified in the Golgi apparatus before being packaged into vesicles for distribution.