Lesson 4 by Hilde Hemmes | Sep 30, 2014 | 0 comments LESSON 4 Course Information Course Instructor Hilde Hemmes Author Members Only FREE MEMBER PRICING All Lessons Lessons 4-6 Lessons 1-6 Lesson 4 Course Lesson Lesson 4 – Urinary System and Skin Before starting this course you must complete the required prerequisite course: Lesson 3