An elderly patient has a broken femur that is healing very slowly. A young resident suggests using a device that will create an electrical field in the area of the fracture to help speed the healing process. Why might this possibly help?
Osteoblasts are attracted to electrical fields produced by bone crystals when they are stressed. This is one of the reasons that trabeculae of bones are organized along stress lines. If the same type of electrical field could be duplicated at the site of the fracture, osteoblasts may be stimulated to migrate to the area and increase the rate of bone production and thus healing of the fracture.
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Which of the following nerves provides innervation for the external genitals?
a) Oculomotor (III) nerve (cranial nerve III) b) Facial (VII) nerve (cranial nerve VII) c) Glossopharyngeal (IX) nerve (cranial nerve IX) d) Vagus (X) nerve (cranial nerve X) e) Pelvic splanchnic nerve
A shallow groove on the surface of the cortex is called a ________.
A) sulcus B) fissure C) gyrus D) furrow
Summarize the important points of meiosis I and II
What will be an ideal response?
Which of the following is a result of convoluted coiling and folding that grants protein its final three-dimensional shape?
A) primary structure B) secondary structure C) tertiary structure D) quaternary structure E) pentagonal