Blog 44: The Electrical Language of Cells

Hey everyone! I hope you all have had a good Sunday so far. For this week’s blog topic, I wanted to explore something that honestly surprised me when I first learned about it.

When we think about how cells work, we usually think in terms of chemistry. Stuff like signals, proteins, and DNA, all of it feels very chemical-based. But cells don’t just communicate using chemicals. They also use electricity. 

And once you start looking at biology through that lens, a lot of things start to look very different.

Cells Are Electrically Active

Every cell in your body maintains a difference in electrical charge across its membrane. This is known as the membrane potential. Basically, the inside of a cell and the outside of a cell have different concentrations of charged particles, like sodium, potassium, and calcium ions.

Because of this imbalance, a voltage difference arises. So even at rest, your cells are not neutral. They are electrically active.

Not Just Neurons

When people hear “electricity in the body,” they usually think about neurons and the brain. And that’s true: neurons use rapid electrical signals to send information throughout the body.

But here’s the surprising part: Almost all cells use electrical signals in some way. For example, your skin cells, heart cells, stem cells, and even developing tissues all rely on electrical gradients and signals to function properly.

So electricity in biology isn’t just about thinking and movement. It’s much more fundamental.

What Do These Electrical Signals Actually Do?

Cells use electrical signals to control a wide range of behaviors.

Changes in voltage can influence:

  • When a cell divides

  • How it grows

  • How it moves

  • What genes are activated

In some cases, electrical signals help guide how tissues form during development. This means that electricity isn’t just a byproduct of biology, but actually a part of how biological systems are controlled.

Bioelectricity and Development

This is where things get really interesting.

During development, groups of cells can form patterns of electrical signals across tissues. These patterns help guide the formation of structures. In a way, cells are using electrical signals as another layer of information, alongside chemical signals.

Some researchers believe these electrical patterns help determine large-scale organization, like where structures should form and how they should be shaped. So instead of just thinking about genes controlling development, you can also think about electrical states influencing biological structure.

Why This Matters for Synthetic Biology

From a synthetic biology perspective, this opens up a completely new way to think about control.

So far, most of what I’ve written about has focused on:

  • Gene regulation

  • Epigenetics

  • Chemical signaling

But bioelectricity adds another layer. If scientists can measure and manipulate electrical signals in cells, they might be able to:

  • Control cell behavior without directly editing DNA

  • Guide tissue formation more precisely

  • Influence healing and regeneration

Instead of just programming cells chemically, we could also be programming them electrically.

The Bigger Picture

This topic really changed how I think about biology.

It’s easy to think of life as purely chemical, but in reality, it’s a combination of chemistry, physics, and information all working together. Electrical signals add another dimension to how cells communicate and make decisions. And just like timing (from last week’s blog), this isn’t always obvious at first, but plays a huge role behind the scenes.

Final Thoughts

One of the coolest things about biology is that the deeper you look, the more layers you find.

Cells don’t just rely on one system to function. They use multiple overlapping systems, chemical, genetic, and even electrical, to coordinate everything they do. Bioelectricity is one of those layers that doesn’t always get talked about, but once you see it, you realize how important it really is.

That’s all I’ve got for this week. I hope this gave you a new perspective on how cells work and maybe made biology feel a little more like physics than you expected.

See you next week.
 — Aidan Kincaid

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