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

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Study for the OCR GCSE Biology Exam. Use multiple choice questions and quiz flashcards with explanations and hints. Excel in your exams!

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Why is the bio-concave shape of red blood cells advantageous?

It allows for faster signal transmission
It provides a larger surface area for oxygen transport
It helps with the absorption of nutrients
It protects against bacteria and viruses

The correct answer is: It provides a larger surface area for oxygen transport

The bio-concave shape of red blood cells is advantageous because it maximizes the cell's surface area relative to its volume. This increased surface area allows for a greater amount of oxygen to diffuse into the cells, enhancing their ability to transport oxygen from the lungs to the rest of the body. Additionally, this shape facilitates the efficient movement of red blood cells through narrow capillaries, ensuring that oxygen delivery can occur effectively at a cellular level. The design of red blood cells, with its thin edges, also allows for more rapid gas exchange, further optimizing the process of oxygen transport throughout the body. This unique structure is central to the efficient functioning of the circulatory system.