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.
The dermis is the deeper skin layer consisting of two layers: the papillary and elastic, both containing collagen. Blood vessels (capillaries) and nerves are found in this layer. The principle structural component of the dermis is the protein collagen, produced by fibroblasts dispersed throughout the dermis.kin cross section showing the epidermis (not to scale). The upper most outer layer of the skin, the epidermis, consists of squamous cells (flat and scale-like in shape) and underneath basal cells (round shaped).