19. True or False: Electrical impulses or actioa potentials (AP) cannot peopagat

Question

19. True or False: Electrical impulses or actioa potentials (AP) cannot peopagate across a synaptic cleft. Instcad, neurotransmitters are used to communicate at the synapse, and re-establish the AP in the postsynaptic cell 20. Substances synthesized or recycled in the neuron cell body are needed in the axon or at the axon terminals Two types of transport systcms carry materials from the cell body to the axon terminals and back. Which of them conveys axoplasm in one direction. a. Slow axonal transport b. Fast axonal transport 21. Which of these transports materials in both directions Slow axonal transport Fast axonal transport a. b. 22. Which of these insulates the neurons in the CNS a. Oligodendrocytes b. Astrocytes c. Microglia 23. Which of these support neurons in PNS a. Satellite cells b. Astrocytes c. Oligodendocytes 24. When an axon is injured, the aids regeneration by forming a .. that guides and stimulates regrowth of the axon. a. b. c. Neurolemma, regeneration tube regencration tube, axon axon, neurolemma 25. White matter of the brain and spinal cord is formed from aggregations of... a. the brain and spinal cord b. myelinated axons from many ncurons c. The lipid part of myelin Like muscle fibers, neurons are electrically excitable. They communicate with one another using two types of electrical signals Which one is used for short distances? 26. a. Graded potentials b. Action potentials

Explanation / Answer

19. True, the structures located at the receptors site called domains of receptor molecules. Domains extend into the synaptic cleft and that bind neurotransmitter. The neurotransmitter is released by the presynaptic neuron. The opening and closing of the ion channels are regulated by the binding of the neurotransmitter directly or indirectly to the postsynaptic membrane.

20.Slow axonal transport in one direction

21. Fast axonal transport flows on both the directions depending upon the flow of material.

22. Oligodendrocyte insulates the neurons of the CNS.

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