![Mecanismos de Actividad Neuronal ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Chapter 33](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)
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Sistema Nervioso II
- 1. SISTEMA NERVISO 2º Parte -sinápsis Chapter 33
- 5. Neurona sin estimulación Chapter 33 (Líquido extracelular) (Citoplasma Neuronal, cargado negativamente) (Membrana Neuronal) Org - Na + Org - Org - Org - Org - K + K + K + K + K + Cl - Cl - Cl - Cl - Na + Na + Na + Canal Potasio Canal Sodio (cerrado)
- 6. Iniciación Potential de Accion Chapter 33 Org - K + K + K + Cl - Na + Na + K + Na + Na + Na + (Líquido Extracelular) (Citoplasma Neuronal, cargado positivamente) (cargado negativamente) Org - Na + Org - Org - K + K + Cl - Na + K + K + K + K + Na + Na + Cl -
- 7. Iniciación de Potencial de Accion Chapter 33 Potencial de acción Líquido extracelular
- 8. Propagación de Potencial de Acción Chapter 33 Potencial de acción Líquido extracelular
- 9. Estructura y Operacion de la Sinápsis Chapter 33 1 Iniciación de un potencial de acción 2 Potencial de Acción llega al terminal sináptico de la neurona presináptica 3 Vesicula Sináptica libera neurotransmisor 4 Receptor se une al neurotransmisor y abre canal iónico
- 10. Axón de una Neurona en Reposo Chapter 33
- 12. Conductos iónicos pasivos Chapter 33
- 13. Conductos iónicos activados por voltaje Chapter 33
- 14. Sucesos eléctricos durante un Potencial de acción Chapter 33 Potencial de reposo Líquido Extracelular (sin carga) umbral PPSI PPSE 1 2 3 Potencial de acción 80 40 0 -40 -80 Potencial registrado (millivolts) Tiempo (milisegundos)
- 15. Potencial de acción Chapter 33
- 16. Acción de los conductos iónicos activados por voltaje Chapter 33
- 19. a) Potencial postsináptico excitatorio (EPSP) b) potencial postsináptico inhibitorio (IPSP) Chapter 33
- 20. Chapter 33
- 21. Circuitos neuronales Chapter 33
Notas do Editor
- Biology: Life on Earth (Audesirk) Chapter 33
- Biology: Life on Earth (Audesirk) Chapter 33 The ionic composition of a neuron’s cytoplasm is significantly different from that of the extracellular fluid. The neuron maintains high concentrations of K+ and large organic ions (Org– ); the extracellular fluid is high in Na+ and Cl– .
- Biology: Life on Earth (Audesirk) Chapter 33 An unstimulated neuron
- Biology: Life on Earth (Audesirk) Chapter 33 Initiation of an action potential
- Biology: Life on Earth (Audesirk) Chapter 33 Initiation of an action potential
- Biology: Life on Earth (Audesirk) Chapter 33 Propagation of an action potential
- Biology: Life on Earth (Audesirk) Chapter 33 The synaptic terminal contains numerous vesicles that enclose a neurotransmitter for which the postsynaptic neuron has membrane receptors. When an action potential enters the synaptic terminal of the presynaptic neuron, the vesicles dump their neurotransmitter into the gap between the neurons. The neurotransmitter diffuses rapidly across the space, binds to postsynaptic receptors, and causes ion channels to open. Ions flow through these open channels, causing a postsynaptic potential in the postsynaptic cell.
- Biology: Life on Earth (Audesirk) Chapter 33 A recording (by oscilloscope) of the electrical events in a nerve cell. The resting potential is about 60 millivolts negative with respect to the outside. 1) When a PSP stimulates the cell to threshold, membrane channels permeable to sodium open and sodium enters the cell, powered by diffusion and by electrical attraction; 2) the inside of the cell becomes positively charged. 3) Shortly thereafter, other membrane channels permeable to potassium open and potassium leaves, driven by diffusion and electrical repulsion from the now-positive inside of the cell, until the resting potential is reestablished.