Answer Happy

Posted: **Wed Jun 08, 2022 7:34 pm**

: Living Cells Pump Singly Ionized Sodium Ions Na From The Inside Of The Cell To The Outside To Maintain A Membrane 1 (59.74 KiB) Viewed 18 times

: Living Cells Pump Singly Ionized Sodium Ions Na From The Inside Of The Cell To The Outside To Maintain A Membrane 2 (13.23 KiB) Viewed 18 times

- Living cells "pump" singly ionized sodium ions, Na, from the inside of the cell to the outside to maintain a membrane potential AVmembrane = Vin Vin Vout= -70 mV It is called pumping because work must be done to move a positive ion from the negative inside of the cell to the positive outside, and it must go on continuously because sodium ions "leak" back through the cell wall by diffusion.

Part B At rest, the human body uses energy at the rate of approximately 100 W to maintain basic metabolic functions. It has been estimated that 15% of this energy is used to operatp the sodium pumps of the body. Estimate-to one significant figure- the number of sodium ions pumped per second.