Tumours: location and spread distinguish the models
| English | Français |
|---|---|
| benign tumour/bɪˈnaɪn ˈtjuːmə/ | benign tumour |
| malignant tumour/məˈlɪɡnənt ˈtjuːmə/ | malignant tumour |
What would explain this observation?
- An abnormal cell growth can remain contained or invade other tissues. The word tumour alone does not specify whether a growth is malignant.
- Start with a prediction. State the quantities or features you would compare, then decide what evidence could distinguish two explanations.
Build the model
- Cancer results from cell changes leading to uncontrolled growth and division. A benign tumour 良性肿瘤 is an abnormal growth contained in one area, usually within a membrane, and does not invade other parts of the body. Malignant tumour 恶性肿瘤 cells are cancerous: they invade neighbouring tissue and can spread in blood to form secondary tumours elsewhere.
- benign tumour: An abnormal growth contained in one area without invasion of other body parts; malignant tumour: A cancerous growth whose cells can invade and spread.
Which feature distinguishes malignant from benign in this model?
Uncontrolled division is different from normal regulated growth, repair and replacement. Lifestyle risk factors and inherited genetic risk factors can contribute to cancer risk, often with several factors interacting. A diagram of spread is a model of a mechanism, not a clinical diagnosis from appearance.
Match each technical term to its precise meaning.
Use the definitions to distinguish related quantities and processes.
Choose evidence that can test it
- Uncontrolled division is different from normal regulated growth, repair and replacement. Lifestyle risk factors and inherited genetic risk factors can contribute to cancer risk, often with several factors interacting. A diagram of spread is a model of a mechanism, not a clinical diagnosis from appearance.
- Use a fictional sequence showing contained growth, invasion and movement to a distant site. Label a primary site and secondary growth without confusing the latter with a new unrelated origin. For data comparisons, state how cases were identified and which population and interval were observed.
Which two habits make the investigation or model in this case more defensible?
Use a fictional sequence showing contained growth, invasion and movement to a distant site. Label a primary site and secondary growth without confusing the latter with a new unrelated origin. For data comparisons, state how cases were identified and which population and interval were observed.
Work from known quantities
- State the known values and their units. Choose the relation because its assumptions fit this case, then rearrange before substitution.
- Known: a fictional image series records model abnormal-cell counts of 20, 40 and 80 at equal intervals. Each interval shows a twofold increase. The trend describes these counts, but neither rapid increase nor size alone tells whether cells invade neighbouring tissue; that requires separate evidence.
A model cell count rises from 30 to 120. Calculate the fold increase. Use the same sequence: known quantities → model → relation → substitution → unit and interpretation.
A model cell count rises from 30 to 120. Calculate the fold increase.
The result is 4 . Known: a fictional image series records model abnormal-cell counts of 20, 40 and 80 at equal intervals. Each interval shows a twofold increase. The trend describes these counts, but neither rapid increase nor size alone tells whether cells invade neighbouring tissue; that requires separate evidence.
Check the conclusion and its limits
- Benign does not mean a growth can never affect an organ, but it does not invade other body sites in this GCSE distinction. A single risk factor does not guarantee cancer, and a rapidly dividing normal tissue is not automatically malignant.
- Return to the original observation. Explain what the result supports, which conditions it assumes, and one way to test a competing explanation.
Every abnormal growth is necessarily a malignant cancer. This claim is false: Benign does not mean a growth can never affect an organ, but it does not invade other body sites in this GCSE distinction. A single risk factor does not guarantee cancer, and a rapidly dividing normal tissue is not automatically malignant.
Tumours: location and spread distinguish the models: Uncontrolled division is different from normal regulated growth, repair and replacement. Lifestyle risk factors and inherited genetic risk factors can contribute to cancer risk, often with several factors interacting. A diagram of spread is a model of a mechanism, not a clinical diagnosis from appearance.
Every abnormal growth is necessarily a malignant cancer.
Benign does not mean a growth can never affect an organ, but it does not invade other body sites in this GCSE distinction. A single risk factor does not guarantee cancer, and a rapidly dividing normal tissue is not automatically malignant.
An abnormal growth contained in one area without invasion of other body parts: write the technical term.
benign tumour means An abnormal growth contained in one area without invasion of other body parts.