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

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What percentage of blood is made up of white blood cells and platelets combined?

The correct answer is: 1%

Blood comprises several components, each of which plays a crucial role in bodily functions. The liquid portion of blood is called plasma, which accounts for roughly 55% of the blood's total volume. The remaining 45% consists of formed elements, which include red blood cells, white blood cells, and platelets. White blood cells and platelets together make up a very small percent of blood volume. In fact, white blood cells generally account for about 1% of the blood's volume, while platelets also contribute to a similar small percentage. When combined, the total percentage of blood made up of white blood cells and platelets is approximately 1%. This value emphasizes their relatively minor volume compared to the predominant red blood cells, which carry oxygen throughout the body. This understanding of blood composition is critical for recognizing the functions and importance of different blood components in health and disease management.