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 components of the nail are the lunula, body, root, and free edge. The lunula is the white half-moon shaped part at the nail base. Both the body and free edge region that overhangs the end of the finger or toe are visible. The nail rests on the thick layer of epithelial skin called the nail bed.The root is hidden under skin folds. Under the root lies the matrix (thick layer of skin). Eponychium (thin layer of epithelium) covers the nail during development; in the adult, it remains at the nail base only and is called the cuticle.hen the cells reach the skin surface, they are sloughed off in a process called desquamation. The next layer, the stratum spinosum, consists of spiny prickle cells that interlock to support the skin. The stratum granulosum, the thin middle layer, initiates keratinization (production of keratin).