Explore Westonci.ca, the premier Q&A site that helps you find precise answers to your questions, no matter the topic. Experience the ease of finding reliable answers to your questions from a vast community of knowledgeable experts. Discover detailed answers to your questions from a wide network of experts on our comprehensive Q&A platform.

What is the function of the capillaries?
A. They have walls only one cell thick to allow diffusion
B. They contain valves to prevent blood flowing in the wrong direction
C. They have walls with multiple cells to cope with high pressure
D. They have thick and elastic walls to cope with high pressure