Fill鈥恑n (1 pt per blank)
9. The binding of _____ to muscarinic receptors opens ion channels indirectly through the action of ____
proteins.
10. Monoamines include _____________, ____________, epinephrine and norepinephrine.
True/False (3 pts each)
Indicate whether the statement is true or false. If true, explain why it is true and/or give examples
to support it. If false, explain why it is false.
11. The process which allows the absorption of glucose across the intestinal wall is entirely passive in which Na+
and glucose are counter transported.
12. The only reason Na+ and K+ are unequal across the cell membrane is because of the Na+/K+ pump.
13. Insulin and epinephrine are large and polar regulatory molecules that will target intracellular receptors.
Bio 9 Homework 2 Fall 2024 (25 points) Name:
Short Answer (3 pts)
14. Given the following concentrations of ions in the intracellular and extracellular fluids of a cell; inside the cell:
Na+ 12mM, K+ 150mM, Cl- 9mM, Ca2+ 0.0001mM and outside the cell: Na+ 145mM, K+ 5mM, Cl- 125mM,
and Ca2+ 2.5mM. Calculate the equilibrium potential for K+ (Ek) if its extracellular concentrations rise from 5
mM to 10 mM.
Use the Nernst equation and the ion concentration to perform the following calculation. Comparing this to the
normal Ek, is the change a depolarization or hyperpolarization.