Hgb is the abbreviation for which component found in the blood?

The abbreviation Hgb stands for hemoglobin, which is a vital protein found in red blood cells. Hemoglobin is responsible for transporting oxygen from the lungs to the rest of the body and carrying carbon dioxide back from the tissues to the lungs. This protein contains iron, which binds to oxygen, making it crucial for respiratory function and maintaining adequate oxygen levels in body tissues.

In the context of this question, other options do not refer to established medical terms or recognized components of blood. For instance, human growth blocks and hormonal growth blood do not have relevant meaning in hematology, while hematocrit growth barriers does not accurately represent any known blood component or function. Therefore, hemoglobin is the only accurate, medically relevant answer in the context of blood composition.