Which Statement About Ion Channels and Voltage-Gated Ion Channels Is

question 1

Multiple Choice

Which statement about ion channels and voltage-gated ion channels is true?

• A) Voltage-gated ion channels are always open.
• B) Ion channels allow ions to flow against their concentration gradients.
• C) Voltage-gated ion channels only open when a stimulus is applied.
• D) Ion channels do not contribute to resting membrane potential.

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Definitions:

Cardiac Arrest

An abrupt loss of heart function, leading to a sudden stop in effective blood flow and requiring immediate emergency treatment.

Mitochondria

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

Isovolumetric Contraction

Isovolumetric Contraction is a phase in the cardiac cycle where the heart's muscle contracts without changing the volume of blood within the ventricles, increasing the pressure.

Period of Ejection

The phase of the cardiac cycle during which blood is pumped out of the ventricles and into the arteries.