Write my Essay on The Interrelationship Between the Systems of the Human Body. It will then explain the roles of the circulatory and lymphatic systems in the immune response and the role of hormones in metabolism.

Write my Essay on The Interrelationship Between the Systems of the Human Body

Introduction
This essay will consider the structure and function of the 11 systems within the human body. It will detail the interrelationship between the nervous system and the musculoskeletal system and between the circulatory system and the lymphatic system. It will then explain the roles of the circulatory and lymphatic systems in the immune response and the role of hormones in metabolism.

Human Body Systems
The human body is made up of 11 separate but interconnected systems (Sherwood, 2007). These are the skeletal, muscular, circulatory, respiratory, digestive, excretory, nervous, integumentary, immune, endocrine and reproductive systems. The success and survival of the human body is dependent on the ability of separate body systems to work together.

The skeletal system provides structure for the human body, stores minerals, produces blood cells and provides protection for delicate organs (Kelly, 2004). 206 bones are connected with ligaments, muscles and tendons, with cartilage, a softer cushion like material, providing protection in jointed areas. Body movements are controlled by the muscular system, with these muscles being connected to bones via tendons (Adams, 2004). Stimulation of these muscles by the nervous system causes contraction and the resulting movement of bones to which they are attached. A number of involuntary muscles ensure the respiratory and circulatory systems continue with contraction of the heart and lungs (Adams, 2004). The heart is central to the circulatory system and acts as to pump blood through arteries, veins and capillaries. The circulatory system is responsible for delivering nutrients and oxygen to cells as well as removing waste products and aiding the immune system through the circulation of white blood cells (Jacab, 2006). The immune system is comprised of lymph organs, such as the spleen and thymus, and the skin, all of which are responsible for protecting the body against invading pathogens (Parham, 2005).

The circulatory system and the respiratory system are closely interconnected with the latter bringing fresh oxygen into the body through the alveoli of the lungs (Johnson, 2004). The respiratory system is closely connected with the excretory system as it is responsible for the removal of carbon dioxide and other waste gases through exhalation. The excretory system eliminates both solid and liquid wastes in addition to these gaseous products, and is made up of a number of specialist tissues along with the large intestine, bladder, kidneys, rectum, lungs and skin (Sherwood, 2007). The physical and chemical breakdown of food into energy is carried out by the digestive system. This system commences with the mouth, teeth and salivary glands then passes through the oesophagus to the stomach and small intestine for digestion. The liver, pancreas and large intestine are also involved, through the production of digestive enzymes and bile and the processing of nutrients (Windelspecht, 2004).

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