Cardiovascular System

by ksirrell
Last updated 5 years ago

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Discipline:
Health & Fitness
Subject:
Sports
Grade:
7,8,9,10,11

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Cardiovascular System

OUTDOOR SPORT

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History

The blood consists of plasma, red blood cells, white blood cells and platelets. During exercise all of these components will be transported around the body to muscles at a quicker rate.Oxygen binds with haemoglobin, in the red blood cells, and is transported around the body. The CV allows achieves this by pumping blood near the alveoli via the capillaries. Diffusion will take place in order to exchange carbon dioxide with oxygen. During exercise, breathing rate and heart rate will increase in order for the exchange of gases to happen at a faster rate and so oxygen can be pumped to working muscles quicker.Platelets are required for the process of clotting. It is a complex process in which chemical reactions cause fibrin strands to form a net and catch red blood cells at the site of injury. Although this prevents blood loss, DVT (deep vein thrombosis), caused by blood clotting, is very common in sports men and women because they are more likely to have a lower heart rate, causing blood to become stagnant, and are more at risk of injury.

Equipment

Functions of the CV System

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The main function of the CV system is to deliver oxygen and nutrients to tissues within the body. Blood absorbs glucose and nutrients (from food digested in stomach) and delivers it to cells. This allows cells to absorb oxygen. During exercise heart rate increases so that the delivery of oxygen and nutrients to cells is also increased.The CV system removes waste products, such as carbon dioxide. This occurs during expiration. During exercise respiration rate will increase so that more carbon dioxide is removed from the body.Thermoregulation is the body's ability to maintain an internal temperature. The CV system achieves through vasodilation and vasoconstriction. Vasodilation is the dilation (widening) of blood vessels. The dilation allows more blood to flow through the vessels, causing more heat loss through the skin. This will occur during exercise in order to keep the body as cool as possible. On the other hand, vasoconstriction is the constriction (narrowing) of the vessels. This increases resistance to blood flow within vessels and therefore reduces heat loss through the skin. During exercise, vasoconstriction should not happen because the body would overheat.


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