Question

ependymal (e - pendi - mal) cells: neuroglia that line the central cavities of the brain and the spinal cord (figure 7.3c). the beating of their cilia helps to circulate the (1 ) fluid that fills those cavities and forms a protective watery cushion around the cns.

• oligodendrocytes (oli - go - dendro - sitz) neuroglia that wrap their flat extensions (processes) tightly around the nerve fibers, producing fatty insulating coverings called (2 ) sheaths (figure 7.3d)

although neuroglia somewhat resemble neurons structurally (both cell types have cell extensions), they are not able to (3 ) nerve impulses, a function that is highly developed in neurons. another important difference is that neuroglia never lose their ability to divide, whereas most neurons do. consequently, most brain (4 ) are gliomas, or tumors formed by neuroglia.
supporting cells in the pns come in two major varieties—schwann cells and satellite cells (figure 7.3e). schwann cells form the myelin sheaths around nerve fibers in the pns. satellite cells act as protective, cushioning cells for (5 ) neuron cell bodies.

o 1 peripheral 2 cerebrospinal 3 myelin 4 transmit 5 tumors

o 1 myelin 2 transmit 3 tumors 4 peripheral 5 cerebrospinal

o 1 tumors 2 peripheral 3 cerebrospinal 4 myelin 5 transmit

o 1 cerebrospinal 2 myelin 3 transmit 4 tumors 5 peripheral

o 1 transmit 2 tumors 3 peripheral 4 cerebrospinal 5 myelin

Explanation:

Ependymal cells circulate cerebrospinal fluid. Oligodendrocytes produce myelin sheaths. Neuroglia can't transmit nerve impulses. Most brain tumors are gliomas. Satellite cells cushion peripheral neuron cell - bodies.

Answer:

1. cerebrospinal
2. myelin
3. transmit
4. tumors
5. peripheral