Unit 5 P4, M1 and D1
This essay will explain the physiologies of the respiratory system and the cardiovascular system and how they work in the metabolism of energy in the body. The respiratory system
The respiration system is the process of supplying oxygen to the cells so that cells can metabolise energy. The main functions of the respiratory system are to maintain oxygen supply to cells, to remove water from the body, and to remove carbon dioxide from the body. It is divided into four sections, three of which are under the ‘external respiration’. These are breathing, gaseous exchange and blood transport. The respiratory system is the internal of tissue respiration carried out inside the body cells. Breathing happens in the thorax, also known as the chest. The thorax is an airtight box that contains the lungs, bronchi and the heart. Air enters the thorax through the nostrils or mouth. Breathing helps to metabolise energy in the body systems, this is done by allowing air to enter the body. Gaseous exchange is the structure of the air around us and the air that we breathe out. Nitrogen is the biggest part of air but is not a part in respiration. The air that we breathe in has high levels oxygen compared to the low levels of blood. The high levels of oxygen move to the low levels of blood. The blood then takes it away and this process continues. Gaseous exchange helps transport different gases into the body which helps metabolise energy in the body. Blood transport happens in the circulatory system. The oxygenated blood gets transported from the lungs to the left atrium of the heart by the pulmonary vein. It then travels around the body by the aorta which sends it to the whole body. When the travelling is finished the oxygenated blood is now deoxygenated blood. The deoxygenated blood then travels back to the lungs by the vena cava to the right atrium into the heart. Now deoxygenated blood has reached the heart, the pulmonary artery carries the blood to the...
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