OCR General Certificate of Secondary Education (GCSE) Biology Practice Exam

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Get ready for the OCR GCSE Biology exam with our comprehensive quiz, featuring flashcards and multiple choice questions. Understand the exam format, key topics, and effective study strategies to excel.

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What helps to increase the efficiency of nutrient and gas exchange in capillaries?

Thick walls
High blood pressure
Extensive branching networks
Small size

The correct answer is: Extensive branching networks

The extensive branching networks of capillaries increase the efficiency of nutrient and gas exchange by providing a larger surface area for diffusion to occur. This branching creates many tiny vessels that are close to cells, facilitating a shorter distance for oxygen, carbon dioxide, and nutrients to travel between the blood and tissues. In addition, the slow blood flow through these capillary networks allows for more time for the exchange processes to take place. As a result, body tissues receive adequate nourishment and waste products can be effectively removed. This design is essential for maintaining proper cellular function and overall homeostasis in the body.