Which statement best reflects the skeletal system's role in mineral storage and blood cell formation?

Which statement best reflects the skeletal system's role in mineral storage and blood cell formation?

• A. It primarily digests food
• B. It filters waste from the blood
• C. It stores calcium and other minerals, and forms blood cells
• D. It conducts nerve impulses

Answer: (C)

The main idea is that bones serve as both a mineral reservoir and a site of blood cell production. Bone tissue stores minerals like calcium and phosphorus, helping maintain mineral balance and blood calcium levels. When needed, hormones trigger bone remodeling to release minerals into the bloodstream. Red bone marrow inside many bones is where hematopoiesis occurs, producing red blood cells, white blood cells, and platelets. In adults, red marrow is primarily in the axial skeleton and the proximal ends of some long bones. This combination—storing minerals and forming blood cells—best reflects the skeletal system’s role. Choices about digestion, kidney filtration, or nerve conduction don’t describe mineral storage or blood cell formation, so they don’t fit this question.

The main idea is that bones serve as both a mineral reservoir and a site of blood cell production. Bone tissue stores minerals like calcium and phosphorus, helping maintain mineral balance and blood calcium levels. When needed, hormones trigger bone remodeling to release minerals into the bloodstream. Red bone marrow inside many bones is where hematopoiesis occurs, producing red blood cells, white blood cells, and platelets. In adults, red marrow is primarily in the axial skeleton and the proximal ends of some long bones. This combination—storing minerals and forming blood cells—best reflects the skeletal system’s role.

Choices about digestion, kidney filtration, or nerve conduction don’t describe mineral storage or blood cell formation, so they don’t fit this question.