AQA GCSE Biology Paper 1 2025 – 400 Free Practice Questions to Pass the Exam

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What is one adaptation of exchange surfaces for efficient transport?

Thick membranes

Small surface area

Lots of blood vessels

One adaptation of exchange surfaces for efficient transport is a high density of blood vessels. This feature enhances the efficiency of material exchange, such as gases, nutrients, and waste products, between the blood and surrounding tissues or air. Having a greater number of blood vessels ensures that more substances can be transported to and from cells quickly. This is particularly important in areas like the lungs or the intestines, where rapid exchange is crucial for maintaining homeostasis and meeting the metabolic needs of the body.

In contrast, thick membranes would impede the speed of diffusion, a small surface area would limit the amount of material that can be exchanged, and no ventilation would reduce the amount of fresh air available for gas exchange in the lungs, all of which detract from the efficiency of transport across exchange surfaces.

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No ventilation

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