What resides in the medullary cavity of long bones?
Spongy bone only.
Compact bone only.
None of these.
Bone marrow.
The Correct Answer is D
Bone marrow is the soft, spongy tissue that fills the medullary cavity of long bones.
Bone marrow contains hematopoietic stem cells that produce blood cells, as well as fat cells and other supportive cells.
Choice A is incorrect because spongy bone is not the tissue that fills the medullary cavity, but the type of bone tissue that surrounds it.
Spongy bone has a porous structure that provides strength and flexibility to the bone.
Choice B is incorrect because compact bone is not the tissue that fills the medullary cavity, but the type of bone tissue that forms the outer wall of the diaphysis.
Compact bone has a dense and hard structure that provides protection and support to the bone.
Choice C is incorrect because none of these is not a valid answer.
The medullary cavity of long bones does contain a specific type of tissue, which is bone marrow.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is B
Explanation
The rib is a part of the axial skeleton, not the appendicular skeleton.
The axial skeleton
Choice A is incorrect because the clavicle is a part of the pectoral girdle, which connects the upper limbs to the axial skeleton.
Choice C is incorrect because the femur is a part of the lower limb, which is supported by the pelvic girdle.
Choice D is incorrect because the scaphoid is a part of the carpals, which are bones of the wrist in the upper limb.
Correct Answer is ["obturator foramen"]
Explanation
The obturator foramen is a large opening in the pelvis that is formed by the ischium and pubis bones.
It is located in the lower part of the pelvis, below the acetabulum (the socket of the hip joint).
The obturator foramen is covered by the obturator membrane, which separates the pelvic cavity from the thigh.
Several important structures pass through or around the obturator foramen, including the obturator nerve, artery, and vein.
Injuries to the obturator nerve can result in weakness or paralysis of the muscles of the inner thigh, while injuries to the obturator artery and vein can result in severe bleeding and require immediate medical attention.
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