Cells of the Immune System. All animals possess a non specific defense system called the innate immune system. CELL SHAPE Cells come in a variety of shapes depending on their function The neurones from your toes to your head are long and thin Blood cells are rounded. In this lesson, students use online resources and perform a lab experiment to learn about the different kinds of cells that make up skin and how the different skin. Innate immune responses attack microbes indiscriminately. Tortoise Adoption Program on this page. Vertebrates have an additional and powerful immune response called adaptive immunity. This feature focuses on elements of the adaptive immune system. Also featured on the HHMI DVD, AIDS Evolution of an Epidemic, available free from HHMI. Download the accompanying worksheet PDF for students to complete as they go through the Click and Learn.