National Cancer Institute at the National Institutes of Health
Seer Training Modules: Introduction to the Endocrine System
Self-guided tutorial where students learn about the structure and function of the human endocrine system.
OpenStax
Open Stax: Anatomy & Physiology: Gonadal and Placental Hormones
Students will identify the most important hormones produced by the testes and ovaries, and learn about the hormones produced by the placenta.