Which of the Following Is True About the Movement of Ions

question 25

Multiple Choice

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

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Definitions:

Neurotransmitters

Chemicals that transmit signals across a synapse from one neuron to another, facilitating communication within the brain.

Mitochondria

Organelles within cells that generate most of the cell's supply of adenosine triphosphate (ATP), used as a source of chemical energy.

Precursor Chemicals

Substances required in the synthetic or manufacturing process of pharmaceuticals or illicit drugs, often regulated to prevent misuse.

Neurotransmitters

Chemicals released by neurons to send signals to other neurons or cells, playing a crucial role in the functioning of the nervous system.