sentence2_structure: The endocrine system<>produces<>most of the hormones$$$the hormones<>regulate<>body functions
sentence1: The endocrine system is the collection of glands that produce hormones that regulate metabolism, growth and development, tissue function, sexual function, reproduction, sleep, and mood, among other things.
sentence2: The endocrine system produces most of the hormones that regulate body functions.
question: Which human organ system produces most of the hormones that regulate body functions?