Chapter 12 - Histology
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
