[glucose]n [glucose]out ICose

The intracellular salt content of a red blood cell is about 150 mM. The cell is put in a 500 mM salt beaker. (a) Describe what will happen to the cell in terms of osmosis if the cell membrane is permeable to water but not to ions. (b) Which direction would solutes diff use if the membrane was permeable to ions: into or out of the cell?

Suppose that initially there are 100 Nat and 25 K+ ions inside the cell, near the sodium-potassium pump. After how many cycles is the number of Na ions the same as the number of Kions inside the cell? With the initial values for each type of ion provided above, how many ions of each type are in the cell? What is the total number of ions at this time? Show your work and explain.

How does Na+/K+ ATPase/Pump promote osmosis across plasma membrane? How does it establish the basal metabolic rate? Lastly, what does it mean when the pump self-phosphorylates during transportation?

Explain why Na+ is low inside cells despite a large concentration gradient inward

The average human generates approximately his or her weight in ATP every day. A resting person uses about 25% of this in ion transport—mostly via the Na+-K+ ATPase. About how many grams of Na+ and K+ will a sedentary 70-kg person pump across membranes in a day?

If a skeletal muscle has depleted its stores of ATP how will the altered transport properties of the following transporters affect cytosolic ion concentrations (increase, decrease, no change) relative to normal?   Skeletal Muscle Cell With Depleted ATP Stores Ion transporter Cytosolic K+ Cytosolic Na+ Cytosolic Ca2+ NKA         NCX         SERCA

Could some one explain the correct answer for the question in the drop down box

Pertains to membrane transport and signaling

What is the most important thing, i.e. what has the biggest impact of determining the resting membrane potential of a cell?