A End-plate potential Current B 4 = 0 Extracellular side Time 1 Steady state EPSP = 0 Channels in synaptic membrane GEPSP EEPSP (0 mV) 1=0 O Channels in nonsynaptic membrane E (-90 mV) EPSP Cytoplasmic side Time 2 Dynamic (onset of synaptic action) EPSP=+1 Extracellular side EPSP EEPSP E Cytoplasmic side O The EPSP would get smaller in amplitude the capacitive current would be twice as big O The EPSP would last longer Time 3 Steady state (peak of synaptic action) the leak current would be smaller EPSP = 1=0 Extracellular side EPSP EEPSP E₁ Cytoplasmic side 2 ms 10 mV Time 4 Dynamic (decline of synaptic action) EPSP = 0 Extracellular side EEPSP If the same IEPSP was present in a cell that had twice as much membrane capacitance but was otherwise the same, what would NOT happen? E Cytoplasmic side

Anatomy & Physiology
1st Edition
ISBN:9781938168130
Author:Kelly A. Young, James A. Wise, Peter DeSaix, Dean H. Kruse, Brandon Poe, Eddie Johnson, Jody E. Johnson, Oksana Korol, J. Gordon Betts, Mark Womble
Publisher:Kelly A. Young, James A. Wise, Peter DeSaix, Dean H. Kruse, Brandon Poe, Eddie Johnson, Jody E. Johnson, Oksana Korol, J. Gordon Betts, Mark Womble
Chapter12: The Nervous System And Nervous Tissue
Section: Chapter Questions
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A
End-plate
potential
Current
B
1
EPSP = 0
Channels in
synaptic membrane
4=0
Extracellular side
GEPSP
2
Time 1
Steady state
EEPSP
(0 mV)
1=0
O Channels in
·1
9
nonsynaptic membrane
E₁
(-90 mV)
Cytoplasmic side
EPSP
Cm
Time 2
Dynamic
(onset of synaptic action)
EPSP = ₁ + 1
Extracellular side
EPSP
EEPSP
E
Cytoplasmic side
The EPSP would get smaller in amplitude
the capacitive current would be twice as big
O The EPSP would last longer
Time 3
Steady state
(peak of synaptic action)
the leak current would be smaller
EPSP =
!=0
Extracellular side
EPSP
EEPSP
E₁
Cytoplasmic side
2 ms
10 mV
Time 4
Dynamic
(decline of synaptic action)
EPSP = 0
Extracellular side
EEPSP
If the same IEPSP was present in a cell that had twice as much membrane capacitance but
was otherwise the same, what would NOT happen?
E₁
Cytoplasmic side
Transcribed Image Text:A End-plate potential Current B 1 EPSP = 0 Channels in synaptic membrane 4=0 Extracellular side GEPSP 2 Time 1 Steady state EEPSP (0 mV) 1=0 O Channels in ·1 9 nonsynaptic membrane E₁ (-90 mV) Cytoplasmic side EPSP Cm Time 2 Dynamic (onset of synaptic action) EPSP = ₁ + 1 Extracellular side EPSP EEPSP E Cytoplasmic side The EPSP would get smaller in amplitude the capacitive current would be twice as big O The EPSP would last longer Time 3 Steady state (peak of synaptic action) the leak current would be smaller EPSP = !=0 Extracellular side EPSP EEPSP E₁ Cytoplasmic side 2 ms 10 mV Time 4 Dynamic (decline of synaptic action) EPSP = 0 Extracellular side EEPSP If the same IEPSP was present in a cell that had twice as much membrane capacitance but was otherwise the same, what would NOT happen? E₁ Cytoplasmic side
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