AQA Combined Science Biology Chapter Seven


Chapter 7.1

* A non comunicable disease cannnot be passed from one person to another.

* Risk factors are aspects of a persons lifestyle, or substances present in a person's body or enviroment, that have been shown to be linked to an increased rate of disease.

* For some non comunicable diseases, a casual mechanisim for some risk factors has been proven, but not in others.

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Chapter 7.2

* Benign and maligant tumours result from abnormal, uncontrolled cell division.

* Bengin tumours form in one place and dont spread to other tissues.

* Malignant tumours are cancers. The cancerous cells invade neigbouring tissues and many spread in the blood to different parts of the body where they form secondary tumours.

* Lifestyle risk factors for various types of cancer include smoking, obesity, common viruses, and UV exposure. There's also genetic risk factors for some cancers.

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Chapter 7.3

* Smoking can cause cardiovascular disease including coranary heart disease, lung cancer,and lung diseases such and bronchitis and COPD.

* A fetus exposed to smoke has a restricted oxygen supply, which can lead to premature birth, low weight, and even stillbirth.

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