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.
It contains no blood vessels or nerves. Blood nourishes this layer by diffusion. The middle layer of the skin, the layer that is asked about in this question is called the 'dermis' and conatins blood vessels, nerves and other structures.The lower layer of the skin is called the 'sub-cutis' and contains fat.he layer of the skin tht contains blood vessels and nerves closest to the surface of the skin is the __ layer.