Chapter 12 - Histology

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True

All nerve fibers in the central Nervous System (CNS) and in peripheral nervous system (PNS) are covered by a sheath.

True

Astrocytes especially contribute to the blood-brain barrier which means that many antibiotic such as penicillin do not cross the epithelial lining of capillaries to reach the brain.

False

At a chemical synapse, a substance called a neurotransmitter is produced to help the impulse jump the gap from the pre-synaptic fiber to the post-synaptic fiber.

True

At a chemical synapse, a substance called a neurotransmitter is produced to help the impulse jump the gap from the pre-synaptic fiber to the post-synaptic fiber.

False

At an electrical synapse, gap junctional connexons serve to make more easy the passage of neurotransmitters from the post-synaptic fiber to the pre-synaptic fiber.

True

Dendrites are those neuron processes which carry impulses back toward the cell body.

Schwann cells

In the peripheral nervous system, all nerve fibers are covered by a sheath produced by

False

Nissle bodies found in many neurons consist of areas of dense concentration of smooth endoplasmic reticulum

False

Nissle bodies found in many neurons consist of areas of dense concentration of smooth endoplasmic reticulum.

False

One of the functions of a synapse is to permit passage of impulse conduction equally well in both directions

False

The Central Nervous System consists of the brain, cranial nerves and spinal cord.

irritability

The ability of a neuron to respond to a stimulus is termed

node of ranvier

The area of nerve fiber where little myelin exists which supports saltatory conduction of a nerve impulse is called

True

The axon hillock is a conical space in the neuron cell body which contains no Nissle Bodies

False

The axons of a neuron synthesize all the proteins that are needed for axonal function.

False

The cell body and processes (axons and dendrites) have a dense network of microfilaments to maintain the shape of the cell body and its dendrites and axon.

False

The gray matter of the central nervous system is composed of a myelin sheath produced by oligodendrodria.

astrocyte

The type of neuroglia that is star-shaped and adheres to capillaries and neurons forming a rigid support for cell bodies and axons is called

False

The motor neuron is a good example of a bipolar neuron.

True

The neuroglia are supporting cells of the nervous system and do not carry impulses

microglia

The type of neuroglia composed of tiny cells with long processes that can change into phagocytic macrophages

oligodendroglia

The type of neuroglia which are tree-like in shape and surround CNS axons to produce myelin sheaths is called

ependymal cells

The type of neuroglia which forms a layer of supporting epithelial cells that line brain ventricular and central canal of spinal cord is called

Myasthenia gravis

Which disease listed below is not one linked to preferential damage to the myelin sheath of the peripheral nervous system.

Schmidt-Lanterman Clefts

in myelinated fibers of the peripheral nervous system, a pattern of a diagonal lines is produced which represents trapped cytoplasm and are called


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