The complex logistics of your body's internal transport system
In short: Blood is far more than a simple fluid. This overview breaks down the specialized roles of red cells, white cells, platelets, and plasma in maintaining life.
Blood functions as a sophisticated transport medium, moving nutrients, hormones, waste products, and proteins throughout the body. Red blood cells (RBCs) are specifically adapted for oxygen transport via haemoglobin, featuring a biconcave disc shape and a lack of a nucleus to maximize efficiency.
The immune and repair systems rely on white blood cells and platelets. Phagocytes, such as neutrophils and monocytes, defend against infection through phagocytosis, while lymphocytes produce specific antibodies. Platelets, which lack a nucleus, are essential for clotting to prevent bleeding and block microorganisms. Finally, plasma serves as the vital liquid component that enables all these elements to flow. Exam requirements vary by board: AQA and OCR require less detail on white blood cell types, whereas the CIE curriculum demands comprehensive knowledge of all types.
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Sources
- Summary by Intellect · source: A-Level Biology - Blood - Red & White Blood Cells | Platelets | Plasma (2027/28 exams)
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