Final answer:
Hormones that facilitate intercellular communication in different parts of the body are mostly steroid hormones, which are derived from cholesterol and are able to regulate gene expression by penetrating cell membranes and binding to internal receptors.
Step-by-step explanation:
Many hormones that allow cells in different parts of the body to communicate with each other are steroid hormones. Steroid hormones are synthesized from cholesterol and include adrenocortical hormones and sex hormones. These hormones are released from carrier proteins in the bloodstream, diffuse across the lipid bilayer of the plasma membrane, and bind to intracellular receptors. This binding activates cell signaling pathways that regulate specific genes on the cell's DNA, thereby altering gene expression and influencing cell processes.