Quiz -2 Physiology Questions and Verified Answers

Quiz #2 Physiology Questions and
Verified Answers
Which type of chemical messenger, when released, binds to receptors on the same cell that
released the chemical messenger?


Select one:
a. paracrine
b. autocrine
c. hormone
d. endocrine
e. neurotransmitter - CORRECT ANSWERS -b. autocrine
If a negatively charged ion is more concentrated outside the cell, the forces required to offset
the chemical gradient would be directed _______, and the equilibrium potential for this ion
would be a _______ number.


Select one:
a. outward; negative
b. outward; positive
c. inward; positive
d. inward; negative - CORRECT ANSWERS -a. outward; negative
In its active form, a G protein has a GDP bound to its alpha subunit.


Select one:
a. This is true.
b. This is false. - CORRECT ANSWERS -b. This is false.

, If the concentration of magnesium ions (Mg++) inside the cell is 1.2 mM, and the concentration
of magnesium ions outside the cell is 58 mM, what would be the approximate equilibrium
potential for magnesium?


Select one:
a. 51 mV
b. -103 mV
c. 75 mV
d. 103 mV
e. -51 mV - CORRECT ANSWERS -a. 51 mV
Resting membrane potential results from:


Select one:
a. an uneven distribution of ions across the cell membrane
b. differences in membrane permeability to Na+ and K+
c. both of these
d. neither of these - CORRECT ANSWERS -c. both of these
In neuron membranes, what types of ion channels allow ions to move across the membrane at
rest, and thereby contribute to resting membrane potential?


Select one:
a. resting channels
b. potential-gated channels
c. leak channels
d. voltage-gated channels
e. ligand-gated channels - CORRECT ANSWERS -c. leak channels
What does hematocrit measure?