Which hormones are responsible for maintaining blood glucose level?

A. Plasma is the liquid portion of blood, making up about 55% of total blood volume. It carries nutrients, hormones, electrolytes, and waste products, but it does not contain oxygen-binding proteins. Plasma acts as a transport medium but cannot directly transport oxygen to tissues.

B. Myoglobin is an oxygen-binding protein found in muscle tissue. It stores oxygen and releases it during periods of high muscle activity to support aerobic metabolism. While myoglobin is important for oxygen storage in muscles, it is not responsible for transporting oxygen through the bloodstream to all tissues.

C. Homocysteine is an amino acid formed during the metabolism of methionine. Elevated levels of homocysteine in the blood are associated with increased risk of cardiovascular disease. It does not play a role in oxygen transport and is unrelated to red blood cell function.

D. Hemoglobin is an iron-containing protein present in red blood cells that binds oxygen in the lungs and delivers it to tissues throughout the body. Each hemoglobin molecule can bind up to four oxygen molecules, facilitating efficient oxygen transport. Hemoglobin also carries carbon dioxide, a metabolic waste product, from tissues back to the lungs for exhalation. Adequate hemoglobin levels are essential for maintaining oxygen delivery, energy production, and overall cellular metabolism. Deficiencies in hemoglobin, such as from iron deficiency anemia or blood loss, reduce oxygen-carrying capacity and can lead to fatigue, weakness, and impaired organ function.

A. Calcification refers specifically to the deposition of calcium salts into bone or other tissues. While it is a part of bone formation, it does not encompass the full process of breaking down and rebuilding bone.

B. Bone remodeling is the continuous process in which old or damaged bone tissue is broken down by osteoclasts and replaced with new bone tissue by osteoblasts. This process maintains bone strength, repairs micro-damage, and regulates calcium levels in the body. Remodeling occurs throughout life and is essential for skeletal integrity, adapting bone structure to mechanical stress, and supporting mineral homeostasis.

C. Demineralization is the loss of minerals, primarily calcium, from bone, which weakens bone structure. While it occurs during remodeling, it is not the complete process of both breakdown and rebuilding.

D. Bone growth refers to the increase in bone size or length during development, especially in children and adolescents. Growth primarily occurs at growth plates and is distinct from the remodeling process that continues throughout life.