Central Sterile Services Department (CSSD) Practice Exam

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What is the primary role of hemoglobin in the body?

  1. Transports carbon dioxide from muscles

  2. Transports oxygen to working muscle

  3. Accepts oxygen from mitochondria

  4. Delivers blood to the heart

The correct answer is: Transports oxygen to working muscle

Hemoglobin's primary role in the body is to transport oxygen from the lungs to the tissues, particularly to working muscles. This protein found in red blood cells binds with oxygen during its passage through the lungs and efficiently carries it to various parts of the body where it is needed for metabolic processes. Once it arrives at the tissues, hemoglobin releases the oxygen, allowing cells to use it for energy production, especially during periods of increased physical activity when muscles require more oxygen. In contrast, while hemoglobin does also play a role in the transport of carbon dioxide, its primary function is centered on oxygen delivery. The other options mention functions that are not characteristic of hemoglobin, such as accepting oxygen from mitochondria or delivering blood to the heart, which are related to different physiological processes rather than the direct function of hemoglobin itself.

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