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Our cardiovascular system

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Introduction

TASK 4 BY VICTORIA MCDONALD Our cardiovascular system consists of the heart, vascular system and blood. These organs all work together to supply oxygen to our body, which we need to live. BLOOD Blood is used as a transport system, this picks up oxygen from around our body, and haemoglobin puts the oxygen into cells called red blood cells. Then this gets moved to our muscles that are contracting ready for movement to take place. HEART The heart this is the strongest muscle in the body, and has four parts to it these are called chambers, the heart also has separate parts to it these are called chambers. The left side of the heart consists of oxygenated blood and the right side consists of de- oxygenated. The cycle of the heart, our heart never stops beating. The vein called the pulmonary vein, this vein is attached to the lungs to collect oxygen. Haemoglobin then picks up the oxygen and this is then put into red blood cells. ...read more.

Middle

RESPIRATORY SYSTEM The respiratory system, as we breathe our respiratory muscles contract, these muscles include the diaphragm and internal- external intercostals. As we breathe our rib cage moves upwards and outwards, it does this so we can increase the amount of oxygen in our lungs. The oxygen then travels down the wind pipe. The air passage is the split into two sections for both lungs. The oxygen travels through the bronchus; this then goes into the alveoli. After the air particles are branched out in the alveoli gaseous exchange takes place. When we breathe out the diaphragm and external- inter costals relax. The ribs move inwards and downwards as this decreases the amount of air in the lungs. When we exercise we decide when we breathe, for instance incase we need to breathe faster. BREATHING CONTROL Breathing control, this is controlled by the nervous system this is influenced by chemical changes during exercise. When we breathe at normal rate, nerve impulses from the respiratory system are sent out. ...read more.

Conclusion

The nearer the artery is to the heart, the thicker is the elastic fibres are . The thick elastic walls also help to maintain the high pressure of the blood in the arteries. The high pressure help push the blood along the artery. Shown below is a diagram of an artery showing the structure of it. THE STRUCTURE OF VEINS While veins have the same layers as arteries, i.e. intima, media and adventitia, the organization of each layer is different, reflecting different function. In general veins have to sustain a much lower pressure than arteries, therefore have less need for a thick muscular intima. Veins are the capacitance vessels of the system and must be able to dilate to accept an increased volume. The large veins have a thin media with smooth muscle, elastin and collagen separated from the intima by an incomplete internal elastic lamina. In many large veins valves are present as specializations of the intima. The adventitia is composed largely of collagen and is thicker than in arteries of comparable size. Perivascular nerves are present in the adventitia but are scarce indicating a low level of control of veins by the nervous system. http://www.med.mun.ca/anatomyts/first/lgvein.JPG ...read more.

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