12) Gaps in the myelin sheath are called B) Nodes of Ranvier. C) Sheath of Schwa

Question

12) Gaps in the myelin sheath are called B) Nodes of Ranvier. C) Sheath of Schwann. D) gliomas. 13) The function of Schwann cells is to A) form the myelin sheaths of neurons in the PNS. B) form the myelin sheaths of neurons in the CNS O act as part of the blood-brain brrer. D) act as interneurons E) produce cerebrospinal fluid White matter of the nervous system is composed of A) asgregations of myelinated axons. B) aggregations of cell bodies. C) aggregations of nuclei of cell bodies. D) aggregation of ganglia. E) All are correct 14) 15) The Nodes of Ranvier are A) sites of neurotransmitter storage. B) where the nucleus of a neuron is located C) gaps in the myelin sheath. D) sites of myelin production. E) sites of neurotransmitter production. 16) The branch of a neuron that carries a nerve impulse away from the cell body is the A) axon. B) dendrite. C) perikaryon. D) Nissl body E) Node of Ranvier. lon channels open and close due to the presence of A) ligands B) lids. c) gates. D) doors

Explanation / Answer

12.B.nodes of ranvier

13.A.forms myelin sheath in neurons of PNS

14.A.aggregation of myelinated axons

15.C.gaps in myelin sheath

16.A.axon

17.C.gates

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