The skin is made up of three main layers; dermis, hypodermis and the epidermis. All these layers have distinct functions. Dermis is the deepest layer and is responsible for generating new skin cells. It consists of tough fibres which are responsible for maintaining the skin elasticity, firmness and strength. The dermis is also plays a pivotal role in respiration. It contains eccrine glands which secrete sweat to the surface of the skin (Procter and Gamble, 2009).
Hypodermis is above the dermis and is usually known as the subcutaneous or superficial fiscal. It mostly consist of adipose and acts as storage of body fat. This fat also plays an important role in insulating the body by acting as a shock absorber (Wiley Publishing, 2000). Epidermis is the outermost layer of the skin protects the other layers of the skin. Apart from serving the protective function, the epidermis is responsible for giving the skin its complexion as it has melanocytes which produce melanin (Skinscience.com, n.d).
The bone is another vital organ to the body. Since the bone structure is very critical, it is good to study how and understand it better and know how it is made. The bone is composed of both living and non living substances. The living part is composed of collagen, blood vessels, nerves and living cells like the osteoblast and osteoclast. Bones are formed almost the same way reinforced concrete is made. When a foetus is born, the bones are mainly made up of cartilage and tough tissues. As the foetus grows, the cartilage and connective tissues are replaced with osteoblasts and osteoclasts marking the beginning of the ossification process. This is the process of adding calcium and other mineral salts by the action of tensile, compression and torsol forces. After this, elongation of the bones is achieved through the action of epiphyseal plate (nsbri.org, n.d).
Bone depression is a condition in which the function of the bone marrow is compromised. The bone marrow is unable to make the blood cells properly leading to reduced red blood, white blood cells and platelets. This can lead to anaemic condition or other infections as the immune system is greatly compromised. The major cause of this condition is therapies like chemotherapy and radiation therapy (Depression-doctor.com, 2004).