Dissection: Development of Practical Skills in Biology: Biology OCR A Level

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4 Terms

1
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What can be observed when feeling the walls of the 4 chambers of the heart?

The walls of the atria are thinner than the ventricles, and the wall of the left ventricle is thicker than the right ventricle.

2
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State an observable difference between veins and arteries.

The walls of arteries are thicker, veins have valves and a larger lumen.

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Why are plant tissues stained before they are observed?

So that different tissues can appear as different colours to be more easily identified.

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