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Organisation - Coggle Diagram
Organisation
The Circulatory System
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The natural resting heart rate is controlled by a group of cells located in the right atrium that act as a pacemaker.
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Blood is a tissue consisting of plasma, in which the red blood cells, white blood cells and platelets are suspended.
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Heart Disease
In coronary heart disease layers of fatty material build up inside the coronary arteries, narrowing them. This reduces the flow of blood through the coronary arteries, resulting in a lack of oxygen for the heart muscle.
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Statins are widely used to reduce blood cholesterol levels which slows down the rate of fatty material deposit.
In some people heart valves may become faulty, preventing the valve from opening fully, or the heart valve might develop a leak.
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In the case of heart failure a donor heart, or heart and lungs can be transplanted.
Artificial hearts are occasionally used to keep patients alive whilst waiting for a heart transplant, or to allow the heart to rest as an aid to recovery.
Plant Tissues and Organs
The roots, stem and leaves form a plant organ system for transport of substances around the plant.
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Xylem tissue transports water and mineral ions from the roots to the stems and leaves. It is composed of hollow tubes strengthened by lignin adapted for the transport of water in the transpiration stream.
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Phloem tissue transports dissolved sugars from the leaves to the rest of the plant for immediate use or storage.
Phloem is composed of tubes of elongated cells. Cell sap can move from one phloem cell to the next through pores in the end walls
The leaf is a plant organ composed of tissues: epidermis, palisade and spongy mesophyll, xylem and phloem, and guard cells surrounding stomata.
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Cancer
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Benign tumours are growths of abnormal cells which are contained in one area, usually within a membrane. They do not invade other parts of the body.
Malignant tumour cells are cancers. They invade neighbouring tissues and spread to different parts of the body in the blood where they form secondary tumours.
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Health
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Diseases, both communicable and non-communicable, are major causes of ill health
Factors including diet, stress and life situations may have a profound effect on both physical and mental health.