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.
Skin is composed of three layers: the epidermis, or outermost layer; the dermis, or middle layer; and the subcutis, or basement layer. The dermis contains collagen, elastin, and other fibers that support the skin's structure.It is these elements that give skin its smooth and youthful appearance â and that are damaged by UV radiation (UVR). The UVR that affects the skin is composed of two different types of waves, UVA and UVB.he dermis contains collagen, elastin, and other fibers that support the skin's structure. It is these elements that give skin its smooth and youthful appearance â and that are damaged by UV radiation (UVR). The UVR that affects the skin is composed of two different types of waves, UVA and UVB.