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 pharynx is a fibromuscular cavity that is situated within the throat and is located posterior or at the back of the nasal and the oral cavities. This structure is also found posterior to the larynx.Although the pharynx varies in size depending on the body structure of every individual, this cavity is approximately 5 inches long. It is also divided into three significant regions namely the nasopharynx, the oropharynx and the laryngopharynx or the hypopharynx.ith the help of the circular muscles that lines the walls of the pharynx, the bolus is then pushed through to the esophagus. This process is made possible by the swallowing reflex, which prevents the food from entering the windpipe or the trachea.