Question

Which of the following occurs in the spongy bone of the epiphysis? a. bone growth b. bone remodeling c. hematopoiesis d. shock absorption

Short answer

Answer: Hematopoiesis.

Step-by-step solution

Understanding the term Epiphysis

Epiphysis is the rounded end part of a long bone, it is covered with hyaline cartilage and contains spongy bone with spaces filled with bone marrow. The primary function of the epiphysis is to provide support and strength to the joints.

Examining option a - Bone growth

Bone growth mainly occurs at the epiphyseal plate, which is a region between the epiphysis and diaphysis (the shaft of the long bone). So, bone growth predominantly takes place in the metaphysis, not in the spongy bone of the epiphysis.

Examining option b - Bone remodeling

Bone remodeling is the process of replacing old bone with new bone tissue, ensuring bone strength, and regulating calcium levels in the body. It occurs throughout the whole bone structure, including the spongy bone of the epiphysis but is not its specific function.

Examining option c - Hematopoiesis

Hematopoiesis is the process of blood cell formation and takes place in the red bone marrow, which is found in the spaces of the spongy bone. The red bone marrow of the epiphysis is primarily responsible for the formation of blood cells, so this function is specific to the spongy bone of the epiphysis.

Examining option d - Shock absorption

Shock absorption is a vital function for bones, but it is more closely associated with the articular cartilage, which covers the epiphysis and provides a smooth, cushioned surface for joint movements. While the spongy bone can contribute to shock absorption, it is not its specific function.

Identifying the correct answer

Among the given options, hematopoiesis (option c) is the function that occurs specifically in the spongy bone of the epiphysis. Thus, the correct answer is option c - hematopoiesis.