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  • Biology Factsheet: 34. Species diversity

    Biology Factsheet: 34. Species diversity

    Species diversity is a very important ecological idea. It can be expressed mathematically and describes the number of individuals and the number of species in a community. It is estimated that...

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  • Biology Factsheet: 35. Structure and function of the mammalian heart

    Biology Factsheet: 35. Structure and function of the mammalian heart

      This Factsheet summarises:  l. The structure of the heart and the histology of cardiac muscle.  2. The cardiac cycle and its regulation by the heart itself.  3. The modificat...

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  • Biology Factsheet: 36. Structure and function of blood and lymph

    Biology Factsheet: 36. Structure and function of blood and lymph

      This Factsheet summarises: 1. The structure and function of blood plasma, red blood cells  and white blood cells.  2. The formation of lymph and tissue fluid from blood plasma.&nb...

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  • Biology Factsheet: 37. Ischaemic (Coronary) Heart disease

    Biology Factsheet: 37. Ischaemic (Coronary) Heart disease

      Ischaemia is the term used to describe the condition when there is a mismatch between the amount of oxygen which a cell needs and the amount which it receives.  Insufficient oxygen s...

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  • Biology Factsheet: 38. Animal hormones and hormone action

    Biology Factsheet: 38. Animal hormones and hormone action

      Hormones are organic substances, which can be protein, steroidal, or amine in nature. They are produced by the endocrine system which consists of glands from which hormones are secreted. ...

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  • Biology Factsheet: 39. Carbohydrates: revision summary

    Biology Factsheet: 39. Carbohydrates: revision summary

    Carbohydrates contain 3 elements: Carbon (C), Hydrogen (H) and Oxygen (O). Thus, if we remove water from carbohydrates, all that remains is carbon. Carbohydrates can be divided into 3 categories; mon...

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  • Biology Factsheet: 40. Disease and defence

    Biology Factsheet: 40. Disease and defence

    This Factsheet summarises:  l. The immunological response in humans and the structure of antigens and antibodies. 2. T-lymphocytes and cell mediated immunity. 3. B-lymphocytes and humo...

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  • Biology Factsheet: 41. The role of the liver in homoeostasis

    Biology Factsheet: 41. The role of the liver in homoeostasis

    The liver helps to regulate the composition of the blood and is, therefore, a major homeostatic organ....

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  • Biology Factsheet: 42. The structure and function of lipids

    Biology Factsheet: 42. The structure and function of lipids

      This Factsheet summarises the structure and function of lipids. Lipids are organic compounds found in every type of plant and animal cell. They always contain the elements carbon, hydroge...

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  • Biology Factsheet: 43. Factors affecting enzyme activity

    Biology Factsheet: 43. Factors affecting enzyme activity

      Enzymes are globular proteins which act as biological catalysts. This means that they speed up the rate of reaction by lowering the activation energy, that is the energy required to break bond...

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