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.
Dermis. The dermis is the deepest vascular inner skin layer, and is responsible for providing the skin, its strength, and elasticity. This is because of the fibers of the collagen and elastin. The thickness varies, which is 0.3 mm (min) on the eyelids, and 3.0 mm (max) on the back. The regulation of the body temperature is also undertaken by the dermis. When the body is exposed to heat, blood vessels increase the blood flow to the skin, helping the heat to escape.