Unit 5: Hemoglobin Testing 6 Original: October 1999 Revision: September 2010 Before you learn about how to use the HemoCue machine and take blood from clients, you need to learn about anemia and the causes of anemia.
Skin has three layers: 1  The epidermis, the outermost layer of skin, provides a waterproof barrier and creates our skin tone. 2  The dermis, beneath the epidermis, contains tough connective tissue, hair follicles, and sweat glands. 3  The deeper subcutaneous tissue (hypodermis) is made of fat and connective tissue.
There are basically three layers to the skin, the epidermis on top, the dermis just below that, and below that is the hypodermis or subcutis layer. The epidermis is primarily made of dead skin cells that form a protective layer. It is also where the melanocytes, the color cells of the skin, are found.