Exam 18: Nervous System Cells

Match each term with its definition or description. -Distal tips of these nerve fibers end in branches called telodendria

Small, lipid-soluble molecules can diffuse easily across the blood-brain barrier.

There are about 900 million glia cells in the nervous system.

Gray fibers have no association with Schwann cells.

What comprises the CNS?

Bundles of unmyelinated fibers make up what is referred to as white matter.

Small distinct regions of gray matter in the CNS are called:

The nervous system is organized to do which of the following?

Neurons have, at best, a limited ability to repair themselves.

Match each part of the nervous system with its corresponding description. -Consists of the brain and spinal cord

It is now known that fresh new neurons are often added to existing networks of neurons.

Microglia are functionally and developmentally very close to neurons.

The CNS is composed of efferent nerves only.

There are more glia cells in the brain than there are neurons.

Unipolar neurons have no axons.

The other term for cell body is:

Pathways from the autonomic nervous system that form the thoracic region of the spinal cord would be sympathetic pathways.

The function of the parasympathetic nervous system is commonly described as preparing the body for "fight or flight."

What two systems perform the vital functions of communication and integration of body processes?

Regeneration of nerve fibers is impossible, even if the cell body is intact and the fibers have a neurilemma.