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Chap 18
Week 7 Nervous System Cells
| Question | Answer |
|---|---|
| The largest and most numerous types of neuroglia are the: | astrocytes. |
| Which of the following is the deepest connective tissue layer of a nerve? | Endoneurium |
| Schwann cells have a function in the PNS that is similar to that of which cells in the CNS? | Oligodendrocytes |
| he autonomic nervous system does not stimulate: | skeletal muscles. |
| The part of the nervous system that transmits impulses from the CNS to the skeletal muscle is the: | somatic nervous system. |
| Multipolar neurons have: | multiple dendrites and one axon. |
| The afferent pathways of the autonomic nervous system: | carry feedback information to integrating centers in the brain |
| A neuron that has only one axon but several dendrites is classified as a _____ neuron. | multipolar |
| Small distinct regions of gray matter in the CNS are called: | nuclei. |
| Dendrites conduct impulses _____ cell bodies. | toward |
| Most unipolar neurons are usually: | sensory neurons |
| Fascicles are held together by a connective tissue layer called the: | perineurium. |
| Regeneration of nerve fibers will take place only if the cell body is intact and the fibers have: | a neurilemma |
| A neuron that transmits a nerve impulse toward the central nervous system is called a(n): | sensory neuron. |
| The nervous system is organized to do which of the following? Detect changes in the external environment. Detect changes in the internal environment. Evaluate changes in the environment. All of the above are true. | All of the above are true. |
| The nervous system can be divided: according to its structure. according to direction of information flow. by control of effectors. in all of the above ways. | in all of the above ways. |
| Which is not true of the myelin sheath? | It covers cell bodies in the brain and spinal cord. |
| Along a neuron, the correct pathway for impulse conduction is: | dendrite, cell body, and axon. |
| Neurons in the CNS have less chance of regenerating for all of the following reasons except: | microglia lay down scar tissue. |
| Which of the following compounds cannot cross the blood-brain barrier? | Dopamine |
| Nerves that contain mostly afferent fibers are called _____ nerves. | sensory |
| The white matter of the nervous system is made up of: | myelinated fibers. |
| In the human nervous system: | there are almost equal numbers of glia cells and neurons. |
| The efferent pathways of the autonomic nervous system consist of the ________ nervous systems. | sympathetic and parasympathetic |
| Interneurons reside in the: | CNS only. |
| Gray matter in the brain and spinal cord consists primarily of: | cell bodies |
| One of the components of the blood-brain barrier is: | astrocytes. |
| Astrocytes attach to: neurons. oligodendrocytes. blood vessels. both A and C. | both A and C. |
| Which is true of a reflex arc? | It always consists of an afferent neuron and an efferent neuron. |
| Which of the following is not a function of the central nervous system (CNS)? | All of the above are functions of the CNS. |
| Bundles of myelinated fibers make up the | white matter of the nervous system. |
| The _____ of a neuron is a single process that usually extends from a tapered portion of the cell body. | axon |
| What term describes the bundles of nerve fibers within the central nervous system? | TRACTS |
| A signal conduction route to and from the central nervous system is a(n) | REFLEX ARC |
| The _____ nervous system is a complex network of nerve pathways embedded in the intestinal wall with a network of integrators and feedback loops that can act somewhat independently. | enteric |
| Which of the following is not a structural classification of neurons? | POLAR |
| Excitable cells that conduct the impulses are called | neurons. |
| The somatic nervous system carries information to the | skeletal muscles. |
| This tends to be the longest cytoplasmic projection from a neuron. | AXON |
| What structure of the Schwann cell is essential to normal nerve growth and the regeneration of injured nerve fibers? | neurilemma |
| Neurons have | very limited capacity to repair themselves. |
| The ________ of a presynaptic neuron associates with the dendrite of a postsynaptic neuron. | axon terminal |
| Which of these glia cells are located in the peripheral nervous system? | Schwann cells |
| These regions of the neuron direct electrical currents toward the cell body. | DENDRITE |
| The glia cells that help form the blood-brain barrier are the | astrocytes. |
| The efferent pathways of the autonomic nervous system can be divided into the __________ divisions. | parasympathetic and sympathetic |
| This is the site of communication between neurons | synapse |
| The structural and functional center of the entire nervous system is the _____ nervous system. | CENTRAL |
| Chemical signals diffuse between neurons at this location. | synapse |
| Nerves that originate from the brain are called _____ nerves. | CRANIAL |
Created by:
Crystal C
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