How can an X-ray of a child’s femur be used to determine the approximate age of that child?
The Correct Answer is ["epiphyseal analysis"]
The epiphysis is the rounded end of the femur that articulates with the hip bone and knee joint.
As a child grows, the epiphysis gradually fuses with the rest of the bone through a process called ossification.
By examining the degree of fusion of the epiphysis with the femur on an X-ray, doctors can estimate the age of the child.
In general, the younger the child, the less fused the epiphysis will be, and the easier it will be to determine the child's age.
However, it's important to note that this method provides only an approximate age range and cannot be used to determine an exact age.
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Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is ["Ischial tuberosity"]
Explanation
The ischial tuberosity is a bony prominence located at the base of the pelvis.
It is the part of the pelvis that bears weight when sitting and is commonly referred to as the "sitting bone." The ischial tuberosity is attached to several important muscles, including the hamstrings and the adductor magnus, which play a crucial role in hip extension and thigh adduction, respectively.
The ischial tuberosity is also an important landmark for identifying the sciatic nerve, which runs in close proximity to the bone.
Injuries to the ischial tuberosity can occur as a result of prolonged sitting, direct trauma, or repetitive stress, and can cause pain and discomfort in the buttocks and hips.
Correct Answer is C
Explanation
Osteoclasts are the type of cells that increase their activity in response to parathyroid hormone (PTH) and break down bone tissue to release calcium into the blood.
PTH helps maintain the right balance of calcium in the body by stimulating osteoclasts.
Choice A is incorrect because osteoblasts are the type of cells that form new bone tissue by depositing calcium into the bone matrix.
PTH inhibits osteoblasts and reduces bone formation.
Choice B is incorrect because canaliculi are not cells, but small channels within the bone matrix that allow osteocytes to communicate with each other and exchange nutrients and waste.
PTH does not affect canaliculi directly.
Choice D is incorrect because osteocytes are the type of cells that are mature bone cells trapped within the bone matrix.
PTH can stimulate osteocytes to release calcium from the bone, but not as much as osteoclasts.
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