Question

When speaking of myelinating glial cells, we can correctly say that ________.

a. Schwann cells are glial cells found outside the brain and spinal cord; oligodendrocytes are glial cells found in the brain and spinal cord
b. glial cells wrap around the nodes of Ranvier and enable these nodes to act as "jumping points" for saltatory conduction
c. glial cells wrap nerve cell bodies in myelin, so that the electrical circuits are not shorted out
d. Schwann cells are glial cells found within the brain and spinal cord; oligodendrocytes are glial cells found outside the brain and spinal cord
e. Schwann cells and oligodendrocytes form tight layers of overlapping cells

A) Only a
B) all the above
C) a, b, c only
D) b, c, d only

Answer 1

The correct statement about myelinating glial cells is that Schwann cells are located outside the brain and spinal cord and oligodendrocytes are found within these areas, which corresponds to option a. The other options presented are inaccurate. Therefore, the correct answer is A) Only a.

Step-by-step explanation:

Understanding Myelinating Glial Cells

When speaking of myelinating glial cells, we can correctly say that Schwann cells are glial cells found outside the brain and spinal cord; oligodendrocytes are glial cells found in the brain and spinal cord. Thus, option a is true. However, glial cells do not wrap around the nodes of Ranvier, which disqualifies option b. Glial cells do wrap nerve cell bodies in myelin; however, they do not prevent electrical circuits from being shorted out, which eliminates option c. Schwann cells are not found within the brain and spinal cord, and oligodendrocytes are not found outside the brain and spinal cord, which means option d is incorrect. Lastly, Schwann cells and oligodendrocytes do not form tight layers of overlapping cells as suggested by option e.

Therefore, the correct choice in this context is answer A) Only a.