Bioelectrical Phenomenon 4 by Valentina Villadiego https://padlet.com/valevilladiego2104/o2aav5ew32x7672p Biofísica en-us 2021-04-07 14:07:45 UTC 2021-04-14 15:18:25 UTC hello@padlet.com valentinarodriguez563 https://padlet.com/valevilladiego2104/o2aav5ew32x7672p/wish/1391570831 BIOELECTRICAL PHENOMENA

]]> 2021-04-07 14:10:30 UTC https://padlet.com/valevilladiego2104/o2aav5ew32x7672p/wish/1391570831 ION CHANNELS valevilladiego2104 https://padlet.com/valevilladiego2104/o2aav5ew32x7672p/wish/1391572289 2021-04-07 14:10:47 UTC https://padlet.com/valevilladiego2104/o2aav5ew32x7672p/wish/1391572289 RESTING MEMBRNAE POTENTIAL valevilladiego2104 https://padlet.com/valevilladiego2104/o2aav5ew32x7672p/wish/1391574613 2021-04-07 14:11:13 UTC https://padlet.com/valevilladiego2104/o2aav5ew32x7672p/wish/1391574613 DIFUSSION AND EQUILIBRIUM POTENTIALS valevilladiego2104 https://padlet.com/valevilladiego2104/o2aav5ew32x7672p/wish/1391575667 2021-04-07 14:11:26 UTC https://padlet.com/valevilladiego2104/o2aav5ew32x7672p/wish/1391575667 are integral proteins valevilladiego2104 https://padlet.com/valevilladiego2104/o2aav5ew32x7672p/wish/1391577183 2021-04-07 14:11:43 UTC https://padlet.com/valevilladiego2104/o2aav5ew32x7672p/wish/1391577183 Ligand-gated channels are opened or closed by hormones second messengers or neurotransmitters https://padlet.com/valevilladiego2104/o2aav5ew32x7672p/wish/1391578044 2021-04-07 14:11:53 UTC https://padlet.com/valevilladiego2104/o2aav5ew32x7672p/wish/1391578044 A diffusion potential (DP) is the potential difference generated across the membrane because of a concentration difference of an ion valevilladiego2104 https://padlet.com/valevilladiego2104/o2aav5ew32x7672p/wish/1391581291 2021-04-07 14:12:30 UTC https://padlet.com/valevilladiego2104/o2aav5ew32x7672p/wish/1391581291 Ion channels are selective; they permit the passage of some ions but not others (depending: size and charge) valevilladiego2104 https://padlet.com/valevilladiego2104/o2aav5ew32x7672p/wish/1391583145 2021-04-07 14:12:51 UTC https://padlet.com/valevilladiego2104/o2aav5ew32x7672p/wish/1391583145 Voltage-gated channels are opened or closed by changes in membrane potential https://padlet.com/valevilladiego2104/o2aav5ew32x7672p/wish/1391583250 2021-04-07 14:12:52 UTC https://padlet.com/valevilladiego2104/o2aav5ew32x7672p/wish/1391583250 The resting membrane potential is established by diffusion potentials valevilladiego2104 https://padlet.com/valevilladiego2104/o2aav5ew32x7672p/wish/1391587925 2021-04-07 14:13:45 UTC https://padlet.com/valevilladiego2104/o2aav5ew32x7672p/wish/1391587925 The activation gate of the Na channel in nerve is opened by depolarization; when open, the membrane is permeable to Na https://padlet.com/valevilladiego2104/o2aav5ew32x7672p/wish/1391592602 2021-04-07 14:14:40 UTC https://padlet.com/valevilladiego2104/o2aav5ew32x7672p/wish/1391592602 Each permeable ion attempts to drive the membrane potential toward its equilibrium potential. Ions with highest permeabilities, or conductances, will make the greatest contribution to the resting membrane potential, and those with the lowest permeabilities will make little or no contribution valevilladiego2104 https://padlet.com/valevilladiego2104/o2aav5ew32x7672p/wish/1391597560 2021-04-07 14:15:37 UTC https://padlet.com/valevilladiego2104/o2aav5ew32x7672p/wish/1391597560 The Nerns equation is used to calculate the equilibrium potential at a given concentration difference of a permeable ion across the cell membrane. It tell us at what potential would the ion be at electrochemical equilibrium valevilladiego2104 https://padlet.com/valevilladiego2104/o2aav5ew32x7672p/wish/1391615906 2021-04-07 14:19:03 UTC https://padlet.com/valevilladiego2104/o2aav5ew32x7672p/wish/1391615906 The size of the DP depends on the size of the concentration gradient valevilladiego2104 https://padlet.com/valevilladiego2104/o2aav5ew32x7672p/wish/1391628004 2021-04-07 14:21:25 UTC https://padlet.com/valevilladiego2104/o2aav5ew32x7672p/wish/1391628004 opening and closing of channels are controlled by gates valevilladiego2104 https://padlet.com/valevilladiego2104/o2aav5ew32x7672p/wish/1391643684 2021-04-07 14:24:25 UTC https://padlet.com/valevilladiego2104/o2aav5ew32x7672p/wish/1391643684 may be open or closed valevilladiego2104 https://padlet.com/valevilladiego2104/o2aav5ew32x7672p/wish/1391677697 2021-04-07 14:31:01 UTC https://padlet.com/valevilladiego2104/o2aav5ew32x7672p/wish/1391677697 The conductance of a channel depends on the probability that the channel is open. Higher probability --> higher conductance or permeability valevilladiego2104 https://padlet.com/valevilladiego2104/o2aav5ew32x7672p/wish/1391697827 2021-04-07 14:34:58 UTC https://padlet.com/valevilladiego2104/o2aav5ew32x7672p/wish/1391697827 ~ -70mV is expressed as the measured potential difference across the cell membrane in millivolts (mV) valentinarodriguez563 https://padlet.com/valevilladiego2104/o2aav5ew32x7672p/wish/1391704210 2021-04-07 14:36:12 UTC https://padlet.com/valevilladiego2104/o2aav5ew32x7672p/wish/1391704210 A DP can be generated only if the membrane is permeable to the ion valevilladiego2104 https://padlet.com/valevilladiego2104/o2aav5ew32x7672p/wish/1391705462 2021-04-07 14:36:27 UTC https://padlet.com/valevilladiego2104/o2aav5ew32x7672p/wish/1391705462 is expressed as the measured potential difference across the cell membrane in millivolts (mV) valevilladiego2104 https://padlet.com/valevilladiego2104/o2aav5ew32x7672p/wish/1391706933 ¿A DÓNDE SE CONECTA ESTE CONCEPTO?]]> 2021-04-07 14:36:44 UTC https://padlet.com/valevilladiego2104/o2aav5ew32x7672p/wish/1391706933 The sing of the DP depends on whether the diffusing ion is positively or negatively charged valevilladiego2104 https://padlet.com/valevilladiego2104/o2aav5ew32x7672p/wish/1391713425 2021-04-07 14:38:00 UTC https://padlet.com/valevilladiego2104/o2aav5ew32x7672p/wish/1391713425 The equilibrium potential is the diffusion potential that exactly balance the tendency for diffusion caused by a concentration difference. At electrochemical equilibrium, the chemical and electrical driving forces that act on an ion are equal and opposite and no more net diffusion of the ion occurs https://padlet.com/valevilladiego2104/o2aav5ew32x7672p/wish/1391752162 2021-04-07 14:45:14 UTC https://padlet.com/valevilladiego2104/o2aav5ew32x7672p/wish/1391752162