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 ["Surgical neck of the humerus"]
Explanation
The surgical neck of the humerus is a part of the bone that lies below the greater and lesser tubercles and is a common site for fractures.
It is the most constricted part of the humerus and marks the transition between the expanded proximal end and the narrower shaft.
The neck is located between the tuberosities and is the site of attachment for the capsule of the shoulder joint.
The axillary nerve and posterior circumflex humeral artery also pass through the surgical neck.
The anatomy of the surgical neck is important in the diagnosis and treatment of shoulder injuries and fractures.
Correct Answer is B
Explanation
The joints between the vertebrae are secondary cartilaginous joints (symphyses) that are formed by the intervertebral discs between the vertebral bodies.
A symphysis is a type of joint that has a fibrocartilaginous disc between two bones that allows slight movement.
Choice A is incorrect because synarthrotic joints are immovable joints, such as the sutures of the skull.
Choice C is incorrect because sutures are fibrous joints that are found only in the skull.
Choice D is incorrect because gomphosis is a type of fibrous joint that anchors a tooth to its socket in the jaw.
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