The Human Body in Health & Disease has several built-in resources to jump-start a conversation.
For example, the Blood chapter includes a boxed sidebar that highlights the contributions of Charles Richard Drew to hematology—particularly in the establishment of blood banks.
In the Nutrition & Metabolism chapter, there's another boxed sidebar that mentions the role of George Washington Carver in the rise of food science.
Just these two snippets can be a conversation starter in your course. Consider asking your students to contribute more—perhaps as a project or other assignment.
You might also want to check out Black History Month: Celebrating Blacks in Science, Promoting Diversity in STEM to stimulate some ideas for your course.