Cardiovascular system essay

The paired kidneys in the upper part of the abdomen toward the back balance the fluid levels of the body. They balance the body's acid/alkaline nature and the concentrations of salts, minerals and other materials. The blood is filtered, purified, cleansed and adjusted twenty-four hours every day. Hundreds of pints of blood flow through these organs daily, about one-fourth of the heart's output or approximately the body's entire volume. The blood circulates through the kidneys twenty times each hour for purification. About two and one-half pints of...

Capillaries:

  • site of exchange of materials between blood & tissues
  • exchange may occur by simple diffusion
  • diffusion enhanced by:
    • thin capillary walls (just one cell thick)
    • narrow capillaries (so the red blood cells & plasma are close to the walls)
    • large numbers (the human body has 10 - 40 billion capillaries!) which translates into a tremendous amount of surface area through which exchange can occur
    • relatively slow flow of blood (providing more time for exchange to occur)
  • exchange also occurs through pores (located between the cells the form the capillary walls), by vesicular transport (., pinocytosis), & by bulk flow

Dairy foods such as milk, yogurt and cheese are important sources of at least 10 essential nutrients including vitamins A and B12, calcium, carbohydrate, magnesium, phosphorus, potassium, protein, riboflavin and zinc. For good general and cardiovascular health, make sure you get your 3 serves of dairy foods every day. A serve of dairy could include one glass (250mL) of milk, one tub (200g) of yogurt or two slices (40g) of cheese. With the wide variety of dairy foods available, there is a choice to suit everyone as part of a heart-healthy lifestyle.

Cardiovascular system essay

cardiovascular system essay

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