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Questions and Answers
What type of bone marrow is present throughout all bones at birth?
What type of bone marrow is present throughout all bones at birth?
- Red bone marrow (correct)
- White bone marrow
- Yellow bone marrow
- Green bone marrow
Which statement is true regarding the type of bone marrow present in adults?
Which statement is true regarding the type of bone marrow present in adults?
- Yellow bone marrow is absent in adults.
- Adults have only red bone marrow throughout all long bones.
- Red bone marrow is restricted to the meshes of spongy bones. (correct)
- Red bone marrow replaces yellow bone marrow in long bones.
During childhood, what happens to red bone marrow in the distal long bones?
During childhood, what happens to red bone marrow in the distal long bones?
- It is partially replaced by yellow bone marrow. (correct)
- It is completely replaced by white bone marrow.
- It remains unchanged.
- It is converted to cartilage.
Where is red bone marrow found in adults?
Where is red bone marrow found in adults?
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What fills the medullary cavity of long bones in adults?
What fills the medullary cavity of long bones in adults?
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Study Notes
Bone Marrow
- Bone marrow is the soft, spongy tissue within bones responsible for producing blood cells.
- It is found in the medullary cavity of long bones and the spaces of cancellous bone.
- At birth, bone marrow is entirely red, filling the marrow cavities of all bones.
- Red bone marrow is responsible for producing all types of blood cells.
- During childhood, some red bone marrow is replaced by yellow bone marrow, particularly in the distal long bones.
- Yellow bone marrow is mainly composed of fat cells, and does not produce blood cells.
- In adults, red bone marrow is only present in specific locations, including the skull, vertebrae, sternum, ribs, hip, upper femur, and humerus.
- Yellow bone marrow fills the medullary cavity of most long bones in adults.
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