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Surplus red blood cells, needed to meet an emergency, are MAINLY stored in which organ of the human body?

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Surplus red blood cells, needed to meet an emergency, are MAINLY stored in which organ of the human body? Answer: Spleen

The spleen acts as a reservoir for red blood cells (RBCs) and platelets. During emergencies like hemorrhage or hypoxia, the spleen contracts and releases stored RBCs into circulation to maintain oxygen delivery.

Question context

This question is part of 🦠 Microbiology within the broader 🧬 Medical Science subject and appears in the SPSC – Sindh Public Service Commission preparation collection. Reviewing the answer together with nearby questions helps reinforce the underlying concept and identify how it may appear in competitive exams.