ch 12 nervous system flashcards _ Quizlet

01 m eters per second 1 20 m eters per second 1 2 m

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Unformatted text preview: on potentials regenerated as they propagate along a m y elinated axon? at ev ery segm ent of the axon at the internodes at the nodes at m y elin a-d The noded to-node "jum ping" regeneratio n of an action potential q uizlet.com/7971136/ch- 12- ner vous- system- flash- car ds/# 46/55 11/3/13 ch 12 ner vous system flashcar ds | Quizlet along a m y elinated axon is called ________ __. local propagation continuous propagation m y elinated propagation saltatory propagation a-d How do c action potential propagation speeds in m y elinated a nd unm y elinat ed axons com pare? Propagation is faster in unm y elinat ed axons. Propagation speeds are sim ilar in both axon ty pes. Propagation is faster in m y elinated axons. Propagation in m y elinated axons is faster ov er short distances, but slow er q uizlet.com/7971136/ch- 12- ner vous- system- flash- car ds/# 47/55 11/3/13 ch 12 ner vous system flashcar ds | Quizlet ov er long distance a-d Multiple b sclerosis (MS) is a disease that stops action potential propagation by destroy ing the m y elin around (norm ally ) m y elinated axons. Which of the follow ing best describes how MS stops action potential propagation ? Without m y elin, the internode m em brane is depolarized m ore easily . Without m y elin, the internode m em brane resistance decreases, prev enting local currents from reaching adjacent q uizlet.com/7971136/ch- 12- ner vous- system- flash- car ds/# 48/55 11/3/13 ch 12 ner vous system flashcar ds | Quizlet nodes. Without m y elin, the node m em brane m ore easily becom es refractory . Without m y elin, the internode m em brane resistance increases, prev enting local currents from reaching adjacent nodes. a-d The b acety lcholin e receptor is an exam ple of w hat ty pe of channel? a v oltagegated channel a chem ically gated channel a leak channel a m echanicall y gated c h a nne a-d Which of the c q uizlet.com/7971136/ch- 12- ner vous- system- flash- car ds/# 49/55 11/3/13 ch 12 ner vous system flashcar ds | Quizlet follow ing best describes the role of calcium in sy naptic activ ity ? Calcium diffuses across the sy naptic cleft to bind w ith receptors on the postsy naptic cell. Calcium enters the postsy naptic cell and causes depolarizati on. Calcium enters the presy naptic cell and causes the release of ACh. Calcium breaks dow n acety lcholin e. a-d Which of c the follow ing best describes how ACh causes depolarizati on of the q uizlet.com/7971136/ch- 12- ner vous- system- flash- car ds/# 50/55 11/3/13 ch 12 ner vous system flashcar ds | Quizlet postsy naptic m em brane? ACh activ ates acety lcholin esterase (AChE). ACh opens v oltagegated calcium channels. ACh opens ACh receptors. ACh causes v esicles to fuse, releasing neurotrans m itter into the sy naptic cleft. a-d Curare is a d drug that prev ents ACh from binding to ACh receptors. How w ould y ou expect curare to affect ev ents at a cholinergic sy napse? Calcium w ould not diffuse into the presy naptic neuron. Vesicles q uizlet.com/7971136/ch- 12- ner vous- system- flash- car ds/# 51/55 11/3/13 ch 12 ner vous system flashcar ds | Quizlet w ould not release ACh. Acety lcholin esterase (A...
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This note was uploaded on 11/04/2013 for the course CHEM 002 taught by Professor Vidensik during the Fall '10 term at UC Merced.

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