Typically counted as 1/2 credit for high school students.
Precepts of Anatomy and Physiology
With a combination of text and graphics, Precepts of Anatomy and Physiology will teach your older child about the interdependency of body systems, bone, tissue, and organs of the incredible human body.
It will also delve into that awkward topic, reproduction. It is a judgment call, how much you teach and when but if your teens are ready for a more mature look at the origin of human life, this is the most age-appropriate we have seen. All the nitty-gritty details a teen needs to know, with the author's much-appreciated bias about the necessity of marriage as a prerequisite.