Keeping Healthy

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  • Created by: Abi
  • Created on: 21-05-13 19:32
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  • Keeping Healthy
    • Heart Disease
      • Blood carries oxygen and nutrients to the body’s cells,
      • The circulatory system consists of:the heart, which is the muscular pump that keeps the blood movingthe arteries, which carry blood away from the heartthe veins, which return blood to the heartthe capillaries, which are tiny blood vessels that are close to the body’s cells
      • Genetic and lifestyle factors can lead to the coronary arteries becoming blocked, and an increased risk of heart disease.
      • Heart Attacks
        • A heart attack can happen because:Fatty deposits build up in the coronary arteries.A blood clot can form on a fatty deposit.The blood clot can block a coronary artery.Some heart muscle cells do not get the oxygen and nutrients they need.These cells start to die.
        • In the UK about 300,000 people have a heart attack every year.
      • CAUSES OF HEART DISEASE
        • Heart disease is not usually caused by micro-organisms. It is caused by:genetic factors, which show as a family history of heart diseaselifestyle factors
        • This is due to lifestyle factors including:   ·         smoking ·         lack of regular exercise ·         stress leading to a fast heart rate ·         drinking a lot of alcohol ·         poor diet
        • A lack of exercise and a diet that is high in salt and saturated fat cause people to:become overweighthave high blood pressurehave high levels of cholesterol in their bloodThese factors contribute to an increased risk of heart disease.
    • Ateries and Veins
      • Ateries
        • Blood in the arteries is under high pressure generated by the heart. The arteries have:thick outer wallsthick layers of muscle and elastic fibres
      • Veins
        • The blood in veins is under lower pressure than the blood in arteries. The veins have:thin wallsthin layers of muscle and elastic fibres
      • The arteries carry blood from the heart, while veins return blood to it. With both, their structure is related to their function.
    • The Heart
      • The heart is a muscular organ. It keeps beating at about 70 times per minute.
      • The muscle cells in the heart need a constant supply of oxygen and nutrients, and for their waste products to be removed. So the heart requires its own blood supply in order to keep beating.

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