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

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Which of the following best describes the role of blood?

  1. Remove waste products only

  2. Transport nutrients and gases

  3. Maintain body temperature

  4. Digest food

The correct answer is: Transport nutrients and gases

The role of blood is best described by its function in transporting nutrients and gases throughout the body. Blood acts as a vital fluid that circulates through the cardiovascular system, delivering essential substances such as oxygen and glucose to cells, while also transporting carbon dioxide and other waste products away from those cells for elimination. This transport is crucial for maintaining cellular function and overall homeostasis in the body. While blood does help with waste removal, its primary role encompasses much more than that; it is fundamentally involved in the distribution of nutrients and gases, which directly support metabolic processes and energy production in cells. Furthermore, although blood plays a part in maintaining body temperature and is involved in digestion indirectly through the transport of nutrients absorbed from the digestive system, these functions are secondary to its main roles in transportation.

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