Examlex
Covalent bonding typically occurs when a ______________ bonds with a ______________.
Channels
Structures that form pores in the membranes of cells and organelles, allowing the selective passage of ions or molecules across the membrane and thus contributing to vital physiological processes.
Calcium
A chemical element essential for living organisms, including bone formation, blood clotting, and muscle function.
Potassium
A chemical element with symbol K, essential for various bodily functions including nerve transmission and muscle contraction.
Action Potential
A rapid, temporary change in the electrical membrane potential of a neuron or muscle cell, allowing the transmission of signals.
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