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The Biological Basis of Health "Give an account of the role of the cardiovascular system in maintaining biological health"

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Introduction

200173340 HECS 1005 The Biological Basis of Health "Give an account of the role of the cardiovascular system in maintaining biological health" 08/12/05 Give an account of the role of the cardiovascular system in maintaining biological health Biological health can be defined as the state where the cells of the body are functioning optimally. This is dependant upon the maintenance of the dynamically stable internal environment of the body. The internal environment is the extracellular fluid that surrounds the cell and provides the conditions needed for the cells to function optimally. In order to maintain the composition of the internal environment, a mechanism called homeostasis is used (Waugh, 2001). The cardiovascular system plays a vital part in homeostasis since it acts as a transport system to the internal environment, not only providing the cell with vital nutrients, but also removing the metabolic waste released by the cells (Karch, 2006). This transport mechanism ensures that the composition of the internal environment remains within the normal boundaries, thus allowing the cells to perform to their optimum. Within the cardiovascular system there are three circulatory pathways: the systemic system, the pulmonary system and the coronary system (Turner, 1976). ...read more.

Middle

An efficient diffusion pathway is also important for the removal of metabolic waste that builds up in the cells, if the waste builds up the cell can no longer function properly and may become necrotic. Waste products are able to passively diffuse out of the cells and into the capillary since there is a higher concentration of waste substances in the cell than in the capillary (Marieb 2004). Water molecules rely on the hydrostatic and osmotic pressures in the capillaries to enter and leave the tissue cells (Adragna et al 1990). At the arterial end of the capillary they are filtered out of the capillary and into the interstitium. This is because the hydrostatic force, created by the capillary blood pressure, is higher at the arterial end of the capillary than at the venous end and so fluid is forced out (Adragna et al 1990). At the venous end of the capillary the hydrostatic pressure is much lower, this coupled with the oncotic pressure caused by the high concentration of large proteins in the venous end of the capillary, means that water is drawn back into the capillary by osmosis (Karch, 2006). ...read more.

Conclusion

In conclusion the cardiovascular system helps to maintain a constant homeostatic temperature, as well as optimum glucose and pH levels. The cardiovascular system also delivers vital nutrients that the cell needs and helps to remove and dispose of the metabolic waste that each and every cell produces. It is clear that the cardiovascular system plays a vital part in maintaining an internal environment in which the cells of the body are able to work optimally and as a result biological health is attained. Word count - 1100 Reference List Adragna, P.J, Schmidt, R.R, Solomon, E.P., (1990) Human anatomy and physiology. 2nd Ed. Philadelphia: Saunders College Boyle, M. (2000) AQA (B) Biology: core principles. London: HarperCollins Karch, A.M. (2006) Focus on Nursing Pharmacology. 3rd Ed. Philadelphia: Lippincott Williams and Wilkins. Marieb, E.N. (2003) Human Anatomy and Physiology. 6th Ed. San Francisco: Pearson. Seeley, R. (1992) Anatomy and Physiology. 2nd Ed. St Louis: Mosby Year Book. Tortora, G.J. (2005) Principles of Human Anatomy. 10th Ed. New York; Chichester: Wiley Turner, P.P. (1976) the Cardiovascular System. Edinburgh: Churchill Livingstone. Waugh, A. (2001) Ross and Wilson Anatomy and Physiology in health and illness. 9th Ed. Edinburgh: Churchill Livingstone. ?? ?? ?? ?? 1 ...read more.

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