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Describe the different components of the circulatory system and state how these will alter with the onset of exercise.

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Year 11 Circulatory Project Describe the different components of the circulatory system and state how these will alter with the onset of exercise. By Shahrooz Mohammadi Circulatory System Blood is a very important and vital liquid that is essential to the body, without it the human body cannot function at all. The blood has a lot if crucial jobs, blood carries oxygen and food to the body organs, blood also takes waste and carbon dioxide away from these organs. The human body contains a lot of blood vessels, (Arteries, Veins, and Capillaries) the blood is directed through these vessels to different parts of the body. In order for this vital liquid to go around the body obviously there has to be some kind of force pushing the blood through the vessels, the heart does this; it acts as a pump and drives the blood out to the body. This whole system of blood vessels, heart and the blood is called the circulatory system. The Heart Key parts of the Heart Atria- they make up the top two chambers of the heart, they contract and relax to pass the blood down to the ventricles. Ventricles- they are the two bottom chambers of the heart, they pump the blood out to the lungs and the rest of the body. ...read more.


With exercise the number of heart beats increase because more blood is needed around the body. Stroke volume- is the amount of blood that leaves a ventricle each time the heart, beats. Exercise also increases the amount of blood leaving the heat mainly because the body requires more blood. Cardiac output- is the amount of blood that leaves the left ventricle in one minute, to be pumped around the body. In other words: Cardiac output= Stroke volume x Heart rate Exercise also increases the cardiac output because more blood is needed around the body so the heart rate increases this in term increases the stroke volume therefore there is more blood leaving the heart in one minute during exercises because the body requires more blood. Different types of blood vessels Arteries- are the blood vessels that contain oxygenated blood and carry that blood to body organs. Arteries have got the thickest outer layer because blood with high pressure is pumped into them from the heart. The arteries also pump the blood themselves because they contain an elastic tissue and muscle. The blood stretches the walls then the walls contract and force the blood along. The small branches of the arteries are called arterioles. Veins- the veins contain deoxygenated blood they go from the body to the heart. ...read more.


the stroke volume goes up this leads to the cardiac output going up in a fit person's heart, because the heart has more muscles and is stronger the chambers of the heart are also bigger as a result, so more blood enters and leaves a fit person's heart. This huge amount of blood can get food and oxygen to the working muscles and the waste and carbon dioxide away this is why fit people don't get cramp and last longer in sports. The unfit person's heart is not as strong so when the unfit person's working muscles require blood the heart rate of the unfit person goes up but little amount of blood leaves the heart so the heart wears itself out by pumping too much to try to supply adequate amount of blood to the muscles, the cardiac output of an unfit person is considerably less than a fit person's cardiac output. My pulse rate during a normal day My pulse rate: When: 60 Woke up 68 During the day 144 When doing exercise My pulse rate: When: 90 Before exercise 144 When doing exercise 74 Recovering from exercise Conclusion The circulatory system has a very important job in the body because this system pumps blood to the body through the heart. The heartbeat and the cardiac output depend on the fitness of the person. Exercise alters the heartbeat within each person. ...read more.

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