Composition of Cells

Question 1

• Volume of plasma? ICF? ECF?
• ECF (mM): Na, K, Cl, A-, H2O?
• ICF (mM): Na, K, Cl, A-, H2O?
• Permeability? Na, K, Cl, A-, H2O?
• Role of lipids? Impermeable to?
• Role of proteins? (3)
• Ways to cross membrane? (4)
• Forces that influence gates? (4)
• Example of gateless pathway?

Answer 1

• 3 liters; 27 liters; 13 liters; 5 liters 3rd space
• 140; 5; 145; 0; 55,000
• 14; 145; 5; 126; 55,000
• (-); +; +; -; +
• Maintain electric potential difference; charged species
• Holes in membranes, allowed charged/polar molecules across, function as channels
• Channels, transporters, tunnels, proteins
• Electric, mechanical, chemical, temperature
• Aquaporins