How does aging affect red and yellow marrow and what are the clinical implications?

How does aging affect red and yellow marrow and what are the clinical implications?

• A. Red marrow increases with age.
• B. Yellow marrow becomes red marrow.
• C. Red marrow remains stable.
• D. Red marrow decreases with age and is replaced by yellow marrow, reducing hematopoietic capacity.

Answer: (D)

As people age, red marrow (the hematopoietic tissue) is gradually replaced by yellow marrow (fatty tissue). This shift reduces the body’s capacity to produce blood cells, since yellow marrow has far less hematopoietic activity. In adults, red marrow remains mainly in the axial skeleton and the proximal ends of long bones, but much of it converts to yellow marrow over time. Clinically, this means a smaller hematopoietic reserve, making individuals more susceptible to anemia, infections, and slower recovery from blood loss or stress on the marrow. Yellow marrow’s primary role is fat storage, not blood cell production. The other options don’t fit because red marrow does not increase with age, red marrow does not normally convert to yellow marrow, and red marrow does not remain stable throughout life.

As people age, red marrow (the hematopoietic tissue) is gradually replaced by yellow marrow (fatty tissue). This shift reduces the body’s capacity to produce blood cells, since yellow marrow has far less hematopoietic activity. In adults, red marrow remains mainly in the axial skeleton and the proximal ends of long bones, but much of it converts to yellow marrow over time. Clinically, this means a smaller hematopoietic reserve, making individuals more susceptible to anemia, infections, and slower recovery from blood loss or stress on the marrow. Yellow marrow’s primary role is fat storage, not blood cell production. The other options don’t fit because red marrow does not increase with age, red marrow does not normally convert to yellow marrow, and red marrow does not remain stable throughout life.