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Anatomy And Physiology Essay

1243 words - 5 pages

In this essay will be writing and explain about cardiovascular system. Explaining how it is structured, how it functions and how this two rates to each other and defining anatomy and physiology. My particular area of interest is the heart. The cardiovascular system includes the heart and the blood vessels. Anatomy is the study of the structure of the human body and the physical relationships between body system e.g. organs, cells and tissues. Physiology is the study of how the body works and the way in which their integrated activities maintaining life and health of the individual for example how the heart beats and pumps blood to the whole body. Anatomy and physiology are related because ...view middle of the document...

A group of organs work together to ensure survival of the body by interacting and performing related functions that make up the body system, for example the cardiovascular system. All the organs, cells, tissues and body systems working together make the organism that is a living thing.

The levels of organisation in the cardiovascular system are related by working together to maintain the survival of the body. In a case that one of the cells or organs is not functioning properly it results to a breakdown in the whole system. The heart is a muscular organ; it is positioned in between the lung just to the left of the middle of the chest and behind the rib cage. It is roughly cone shaped hallow muscular organ. It is about 10cm long and it is the size of a clinched fist. It weighed about 225 grams in women and is a bit heavier in men which it is about 310grams. The heart wall is composed of three layers of tissues which are pericardium, myocardium and endocardium. The pericardium is the outermost layer and it is made up of two sacks. The outer sac consists of fibrous and the inner of a continuous double layer of serous membrane, the myocardium is composed of specialised cardiac muscle which can only be found in the heart. It is not under voluntary control but is striated like a skeletal muscle. The endocardium lines the chamber and valves of the heart. It is a thin, smooth, glistening membrane that allows smooth flow of blood inside the heart. The structure of the heart and its associated blood vessels is shown in middle of the chest and behind the rib cage. It is roughly cone shaped hallow muscular organ. It is a thin, smooth, glistening membrane that allows smooth flow of blood inside the heart. The structure of the heart and its associated blood vessels is shown in Figure 1
The heart has got four chambers. These four chambers are divided into two groups and each group has got two chambers. These chambers are called the atria and the ventricles. The four chambers are related because they deliver blood to the heart. The upper chamber is called atria and it has fairly thin walls and dispatch blood through the veins. It works together with the right atrium, superior vena cava and the inferior vena cava to assist blood that is low in oxygen from various sites in the body. The coronary sinus is the smallest veins which can also drain blood into the right atrium, taking it from the wall of the heart. Veins carry blood to the heart and with the exception of the pulmonary vein; they carry deoxygenated blood and waste carbon dioxide. The left...

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