If a common NERVE is completely severed, which of the following structures could be involved? (CHOOSE THE 5 THAT APPLY.) A Axons. B Schwann cells. C Gray matter. D Oligodendrocytes. E Spinal cord tracts. F Somatic motor fibers. G Sensory fibers. H Autonomic fibers.
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The question asks which structures could be involved if a common nerve is completely severed. A nerve is a bundle of axons (nerve fibers) that transmit signals between the brain and other parts of the body. Show more…
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20) Which of the following is not a function of astrocytes? A) control the chemical environment around neurons B) provide the defense for the CNS C) anchor neurons to blood vessels D) support the nutrition of neurons 21) The sympathetic and parasympathetic nervous systems differ ___________ A) in the body location of their ganglia B) in that the pre-ganglionar neuron of one system is inside the CNS, while that of the other system is outside the CNS C) one has only myelinated axons, while the other only has unmyelinated axons D) one has a two-neuron chain from the CNS to the effector organs, while the other has a single efferent neuron. 22) The white matter contains __________. A) neuron cell bodies and dendrites B) myelinated and unmyelinated nerve fibers (=axons) C) unmyelinated nerve fibers only D) myelinated nerve fibers only 23) Visual reflexes, like the iris reflex to changes of light intensity, are integrated in the ___________ A) Superior region of dorsal midbrain (superior colliculi) B) Medulla oblongata C) Lower region of dorsal midbrain (inferior colliculi) D) Pons 24) Over 90% of all parasympathetic axons are derived from cranial nerve number __________. A) V (trigeminal) B) VIII (vestibulocochlear) C) XII (hypoglossal) D) X (vagus) 25) Collections of nerve cell bodies (without or with dendrites) outside the central nervous system are called __________. A) nuclei B) ganglia C) nerves D) tracts 26) Which of these effectors is not directly controlled by the autonomic nervous system? A) skeletal muscle B) most glands C) cardiac muscle D) smooth muscle 27) What are neuroglia that play an active role in moving the cerebrospinal fluid called? A) oligodendrocytes B) astrocytes C) Schwann cells D) ependymal cells 28) Collections of nerve cell axons outside the central nervous system are called __________. A) ganglia B) nerves C) tracts D) nuclei
Adi S.
1. Brain and Spinal Cord. A. Interneuron. 2. Helper Cell. B. Neuromuscular Junction. 3. Functional Cell. C. Dendrites. 4. Sensory Function. D. Neuroglial Cell. 5. Motor Function. E. Neuron. 6. Integration Function. F. Acetylcholine. 7. Enters Neuron. G. Central Nervous System. 8. Exits Neuron. H. Collects stimuli. 9. Neuron and Muscle. I. Axon. 10. Neurotransmitter. J. Sends Commands. 11. Cranial Nerves; Eyes, etc. K. Nodes of Ranvier. 12. Axon Branch. L. Axon Hillock. 13. Cell Body meets Axon. M. Myelin. 14. Bare Axon Spots. N. Collateral. 15. Insulates Axon. O. Peripheral Nervous System. 16. Dura mater P. Motor neuron 17. Gray matter Q. Reflex hammer 18. White matter R. Uses skeletal muscle 19. Arachnoid mater S. Neuron cell bodies 20. Pia mater T. Move hand away from heat 21. Reflex U. Cranial nerves 22. Visceral reflex V. Myelinated axons 23. Knee-jerk reflex (B) W. Innermost meninge 24. Withdrawal reflex X. Fast 25. Gray commissure Y. Sensory receptor 26. Starts reflex Z. Middle meninge 27. Sends command A-1. Sensory receptor 28. Responds to command B-1. Automatic; involuntary 29. Reason for reflexes C-1. Spinal nerves 30. Reflex speed D-1. Cerebrospinal fluid 31. Start neural pathway E-1. Uses smooth muscle 32. Nerves from brain F-1. Effector 33. Somatic reflex G-1. Protection 34. Fluid of nervous system H-1. Outermost meninge 35. Spinal cord nerves I-1. Bridges spinal cord
Qbs E.
Total Magnification Fill in (complete each statement with the correct term) 1. The soma forms a cone-shaped _?_ as it projects to form an axon. 2. _?_ are small, distal branches of an axon. 3. Either Schwann cells or extensions of _?_ can form myelin sheaths. 4. The gaps between the segments of a myelin sheath are called _?_. 5. A group of myelinated fibers may form a region of nerve tissue called _?_ matter. 6. A junction between two neurons, or between a neuron and effector, is called a(n) _?_. 7. A bundle of parallel neuron fibers encased in fibrous connective tissue is called a(n) _?_ (in the PNS). 8. An action potential traveling down a myelinated axon travels _?_ (faster/slower) than in an unmyelinated axon. 9. Unmyelinated nerve tissue is called _?_ matter. 10. _?_ neurons have exactly two projections from the cell body. 11. _?_ neurons have multiple dendrites and a single axon extending from the cell body. 12. In _?_ neurons, a single process from the cell body diverges to form two long branches-one acting as a dendrite and the other as an axon. 13. Schwann cells form myelin sheaths in the _?_ nervous system. 14. Oligodendrocytes form myelin sheaths in the _?_ nervous system. 15. Neuroglial cells called _?_ cells line the fluid spaces of the brain. 16. Small glial cells that phagocytize harmful matter are called _?_. 17. _?_ are ciliated neuroglia that assist the circulation of CSF. 18. Of the two major types of cells in nerve tissue, the _?_ is the most numerous.
Madhur L.
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