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 C
Explanation
Dorsiflexion is the movement of the foot upwards towards the shin.
It involves the contraction of the muscles in the anterior part of the leg, such as the tibialis anterior.
Dorsiflexion is used when walking or running.
Choice A is incorrect because eversion is the movement of the foot outwards, away from the midline of the body.
Choice B is incorrect because plantarflexion is the movement of the foot downwards, away from the shin.
Choice D is incorrect because inversion is the movement of the foot inwards, towards the midline of the body.
Correct Answer is ["Flexion of the hip joint"]
Explanation
Hip flexion refers to the movement of the thigh bone (femur) towards the front of the body, bringing the knee closer to the chest.
This movement is achieved by the contraction of muscles in the front of the hip, including the iliopsoas and rectus femoris muscles.
The joint involved in hip flexion is the hip joint, which is a ball-and-socket joint formed by the articulation between the head of the femur and the acetabulum of the pelvis.
This joint allows for a range of movements, including:
1. Hip extension: This refers to the movement of the thigh bone backwards, away from the front of the body, which is achieved by the contraction of muscles in the back of the hip, including the gluteus maximus and hamstrings.
2. Hip abduction: This refers to the movement of the thigh bone away from the midline of the body, towards the side, which is achieved by the contraction of muscles on the outside of the hip, including the gluteus medius and tensor fasciae latae.
3. Hip adduction: This refers to the movement of the thigh bone towards the midline of the body, which is achieved by the contraction of muscles on the inside of the hip, including the adductor muscles.
4. Hip external rotation: This refers to the movement of the thigh bone away from the midline of the body and outwards, which is achieved by the contraction of muscles on the back of the hip, including the piriformis and gemellus muscles.
5. Hip internal rotation: This refers to the movement of the thigh bone towards the midline of the body and inwards, which is achieved by the contraction of muscles on the inside of the hip, including the gluteus minimus and tensor fasciae latae.
All of these movements of the hip joint are important for walking, running, and other activities that require the use of the lower limbs.
Additionally, a lack of hip flexibility or strength can lead to compensatory movements in other parts of the body, which can result in pain or injury over time.
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