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.
Middle Layer of Skin-Dermis. The dermis is the hub of all operations in the skin where a lot of action takes place. The dermis is tucked away between the epidermis and hypodermis. It is the layer that holds all the blood vessels, nerves, hair follicles, collagen and sweat glands.