Which of the following is true about the movement of ions across excitable living membranes?
A) Ions always move actively across membranes through leakage channels.
B) Some ions are prevented from moving down their concentration gradients by ATP-driven pumps.
C) Sodium gates in the membrane can open in response to electrical potential changes.
D) The bulk of the solutions inside a cell are negatively charged.
B) Some ions are prevented from moving down their concentration gradients by ATP-driven pumps.
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Which of the following combining forms refers to the urinary bladder?
A. cyt/o B. ur/o C. ren/o D. cyst/o
The hyperpolarization that occurs at the end of an action potential is due to the prolonged
A. open state of chemically gated sodium channels. B. open state of voltage-gated sodium channels. C. closure of chemically gated sodium channels. D. closure of voltage-gated potassium channels. E. open state of voltage-gated potassium channels.
The suffix ________ means "structure."
A) -gram B) -pexy C) -um D) -lysis
Parathyroid hormone release is triggered by ________ levels of calcium in the blood.
A. low B. high