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 ["Scapula protraction at the scapulothoracic joint."]
Explanation
Scapula protraction refers to the movement of the shoulder blade (scapula) away from the spine, toward the front of the body.
This movement is also known as scapular abduction or anterior scapular tilt.
The joint involved in scapula protraction is the scapulothoracic joint, which is not a true joint, but rather a functional joint formed by the articulation between the scapula and the thorax.
The scapula is a flat bone that glides over the back of the ribcage, allowing for a wide range of movements of the arm.
Other movements of the scapulothoracic joint include:
Scapula retraction: This refers to the movement of the shoulder blade towards the spine, away from the front of the body.
This movement is also known as scapular adduction or posterior scapular tilt.
Scapula elevation: This refers to the movement of the shoulder blade upwards towards the ears.
This movement is also known as the upward rotation of the scapula.
Scapula depression: This refers to the movement of the shoulder blade downwards towards the feet.
This movement is also known as a downward rotation of the scapula.
Scapula upward tilt: This refers to the movement of the upper border of the shoulder blade upwards, towards the head.
This movement is also known as superior scapular rotation.
Scapula downward tilt: This refers to the movement of the upper border of the shoulder blade downwards, towards the feet.
This movement is also known as inferior scapular rotation.
All of these movements are important for proper shoulder function and are necessary for a wide range of daily activities, such as reaching, lifting, pushing, and pulling.
Correct Answer is D
Explanation
The mastoid process is a bony projection of the temporal bone at the posterior base of the skull.
It allows the attachment of muscles such as the sternocleidomastoid and splenius capitis.
It also contains air-filled spaces called the mastoid air cells.
Choice A is incorrect because the occipital bone forms the back and base of the skull and does not have a mastoid process.
Choice B is incorrect because the sphenoid bone is a butterfly-shaped bone at the base of the skull that does not have a mastoid process.
Choice C is incorrect because the frontal bone forms the forehead and the upper part of the eye sockets and does not have a mastoid process.
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