A model of a red blood cell portrays the cell as a spherical capacitor, a positively charged liquid sphere of surface ar
Posted: Sun Jul 17, 2022 4:15 pm
A model of a red blood cell portrays the cell as a sphericalcapacitor, a positively charged liquid sphere of surfacearea A separated from the surrounding negativelycharged fluid by a membrane of thickness t. Tinyelectrodes introduced into the interior of the cell show apotential difference of 100 mV across the membrane. The membrane'sthickness is estimated to be 99 nm and has a dielectricconstant of 5.00.
(a) If an average red blood cell has a massof 1.20 ✕ 10−12 kg, estimate thevolume of the cell and thus find its surface area. The density ofblood is 1,100 kg/m3. (Assume the volume of blood due tocomponents other than red blood cells is negligible.)
(b) Estimate the capacitance of the cell by assuming the membranesurfaces act as parallel plates.___________ F(c) Calculate the charge on the surface of the membrane.___________ CHow many electronic charges does the surface charge represent?
___________
(a) If an average red blood cell has a massof 1.20 ✕ 10−12 kg, estimate thevolume of the cell and thus find its surface area. The density ofblood is 1,100 kg/m3. (Assume the volume of blood due tocomponents other than red blood cells is negligible.)
(b) Estimate the capacitance of the cell by assuming the membranesurfaces act as parallel plates.___________ F(c) Calculate the charge on the surface of the membrane.___________ CHow many electronic charges does the surface charge represent?
___________