Question

Where is cortical bone found and what kind of marrow does it contain?

A) Long bones, Red marrow
B) Flat bones, Yellow marrow
C) Flat bones, Red marrow
D) Long bones, Yellow marrow

Answer 1

Cortical bone, also known as compact bone, is generally located in the shaft of long bones and contains yellow bone marrow composed of adipose cells.

Step-by-step explanation:

The cortical bone is found in the long bones and it generally contains yellow marrow. Correct answer: D) Long bones, Yellow marrow.

Cortical bone, also known as compact bone, forms the hard outer shell of bones. It is especially prevalent in the long bones of the body, such as the femur, tibia, ulna, and radius. The medullary cavity, which runs through the diaphysis (central shaft) of these long bones, is filled with yellow bone marrow. This yellow marrow consists mainly of adipose cells (fat), especially in adults.

In contrast, red bone marrow is primarily found in flat bones like the ribs and the pelvis, as well as in the spongy bone at the ends of long bones, known as the epiphyses. Red bone marrow is responsible for hematopoiesis, which is the process of creating new blood cells, including erythrocytes (red blood cells), leukocytes (white blood cells), and platelets.