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.
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Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is ["linea aspera"]
Explanation
The linea aspera is a ridge of bone on the posterior surface of the femur.
It is a prominent feature that serves as a site of attachment for several important muscles, including the adductor magnus, vastus medialis, and the long head of the biceps femoris.
The linea aspera extends from the greater trochanter of the femur to the lateral condyle of the femur, dividing the posterior surface of the bone into two distinct regions.
The medial lip of the linea aspera serves as an attachment site for the adductor magnus, while the lateral lip provides attachment for the vastus medialis and the long head of the biceps femoris.
Injuries to the linea aspera can occur as a result of direct trauma or repetitive stress and can cause pain and discomfort in the thigh.
Correct Answer is B
Explanation
The acromioclavicular joint is the articulation between the acromion of the scapula and the acromial end of the clavicle.
It is a plane synovial joint that allows movements of the shoulder girdle. Choice A is incorrect because the ulna and scapula do not form a joint.
The ulna is a bone of the forearm that articulates with the humerus and radius. Choice C is incorrect because none is not a valid option.
There is a specific joint between two bones that is called the acromioclavicular joint.
Choice D is incorrect because the humerus and scapula form a different joint, called the glenohumeral joint.
This is a ball-and-socket synovial joint that allows movements of the shoulder.
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