The speed and direction of ions as they move into and out of the cell are determined by the
A) ability of the ion to let go of its water.
B) concentration gradient and electrochemical imbalances.
C) number of channel proteins present.
D) size and charge of the ion.
E) presence of specific stimuli to open gated channel proteins.

Question

Quizplus · Accepted Answer

The speed and direction of ions as they move into and out of the cell are determined by the concentration gradient and electrochemical imbalances. These factors dictate the direction and rate of movement of ions through ion channels or transporters. The other options, such as the ability of the ion to let go of its water or the size and charge of the ion, may affect some aspects of ion movement, but they are not the primary determinants. The number of channel proteins present and the presence of specific stimuli to open gated channel proteins can also influence ion movement, but these factors are not as fundamental as the concentration gradient and electrochemical imbalances.

The Speed and Direction of Ions as They Move into and Out