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) Ions always move passively across membranes.
C) Sodium gates in the membrane can open in response to electrical potential changes.
D) Ions always move from an area of higher concentration to an area of lower concentration

Question

Quizplus · Accepted Answer

The movement of ions across excitable living membranes can be both passive and active. Sodium gates in the membrane can open in response to electrical potential changes, allowing for passive movement of sodium ions into the cell. Additionally, active transport mechanisms such as ion pumps and channels can move ions against their concentration gradients. Leakage channels do not require energy and are always open, but not all ions move exclusively through leakage channels. Lastly, while ions often move from areas of higher concentration to areas of lower concentration, this is not always the case and is dependent on various factors such as membrane potential and electrochemical gradients.

Which of the Following Is True About the Movement of Ions