ASCP Phlebotomy Technician Certification Practice Exam 2025 – Comprehensive All-in-One Study Guide for Success!

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Which component of blood is primarily responsible for transporting oxygen?

Platelets

Leukocytes

Erythrocytes

Erythrocytes, commonly known as red blood cells, are the primary component of blood responsible for transporting oxygen throughout the body. They contain hemoglobin, a specialized protein that binds to oxygen in the lungs and releases it into tissues needing oxygen for cellular metabolism. This efficient transport system allows for the delivery of oxygen to cells and the removal of carbon dioxide, which is a byproduct of metabolism.

In contrast, platelets are critical for blood clotting and wound healing, leukocytes (white blood cells) play a vital role in the immune system by defending against infections, and plasma serves as the liquid matrix that carries cells, nutrients, hormones, and waste products. Therefore, while all these components play important roles in maintaining health, the specific function of oxygen transport is carried out primarily by erythrocytes.

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Plasma

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