Internal And External Structure Of The Body

2196 WordsDec 1, 20149 Pages
The human body requires a constant supply of materials like water, nutrients and oxygen to the billions of cells that help the body to function properly. As cells do their job they produce waste material which has to be taken out of the body. For this to be possible different systems of the human body need to work together. This assignment will describe the internal and external structure of the heart and explain how different systems of the body work together to maintain healthy cells. It will also explain the stage events of a heartbeat and describe how the heart rate is modified according to the needs of the body. Furthermore it will describe the components of blood and how the structure of the red blood cell relates to its role in transport. With aid of diagrams it will also explain how the structures of blood vessels relate to their function and how tissue fluid is formed and reabsorbed. The human body moves air in and out of the lungs through a process called ventilation. Ventilation has two phases which are inspiration and expiration. During inspiration air is drawn into the body through the nostrils then down the respiratory track until it gets to the lungs. This fresh air which is rich in oxygen is exchanged between the alveoli of the lungs and the capillaries of the pulmonary circulation system [Appendix 3]. This process is called respiration. As deoxygenated blood in the capillaries pass through the lungs, the gas concentration gradient helps to exchange

More about Internal And External Structure Of The Body

Open Document