Human skin color is determined by the interaction of melanin, carotene and hemoglobin. Storage of water, fat, glucose and vitamin D is also a function of the integumentary system, according to the AAD.
1 ExcelTest HSPT Courses offer an intensive program with 12 classes of 3 hours each over 4 - 5 weeks. 2  ExcelTest Courses offer unique and extremely effective strategies not taught anywhere else, by highly experienced, dynamic instructors.
ANCC: There are between 175 or 200 questions. It will take around 4 hours to finish the test depending on the number of questions. AANP: There are 150 questions and the exam lasts 3 hours in length. Youâll have around 50 seconds to answer each question.