Bio-electricity
You Are Electric.
And You Always Were.
Every heartbeat is a voltage wave. Every thought is a cascade of electrical pulses. Every sensation is physics — charged particles crossing a membrane, a signal travelling at the speed of a sprinter. Your body is not just biological. It is electrical. And the physics runs differently in you than the textbooks suggest.
Every cell in my body was carrying voltage. Every single one. Even during those nineteen years when I was exhausted beyond explanation — even when I could not get out of bed, could not concentrate, could not understand why my body felt like it was running on a battery that had never been properly charged — the physics was still happening. The sodium-potassium pumps were still working. The action potentials were still firing. The electricity that makes you a living organism rather than a collection of molecules does not stop. But in a body that is chronically oxygen-deprived, as mine was with undiagnosed thalassemia, the electricity has less energy to work with. The signals are real. They are just quieter.
Bioelectricity is not a metaphor. It is not "energy" in the wellness sense of the word. It is measurable, quantifiable, physical voltage — the kind you can put electrodes on, record on a screen, and express in millivolts. It is the same physics that governs your phone battery and your lightning storm. It governs every signal your nervous system has ever sent. Every heartbeat. Every pain impulse. Every contraction of every muscle, including the extraordinary organ that — in some bodies — can coordinate millions of cells into a single, unified electrical event with no conductor and no pacemaker. Just physics.
What most people do not know is that the bioelectricity of the female body is measurably, specifically different from the male body. Different ion channel expression in the heart. Different nerve conduction characteristics. Different pain signal propagation. A uterine electrical system so unlike anything else in biology that scientists are still working out the mathematics of how it coordinates itself. This is not a small distinction. And it has barely been studied.
The Action Potential
Click to fire a neuron — watch the voltage spike from –70 mV to +40 mV in under a millisecond
The action potential is the most fundamental unit of communication in the nervous system. A nerve fibre at rest is like a spring held under tension — not inactive, but loaded, the sodium-potassium pump continuously doing work to maintain a charge differential of 70 millivolts across the membrane. When a signal arrives strong enough to cross the threshold, sodium channels open. Na⁺ floods in. The membrane potential shoots from −70 mV to +40 mV in under a millisecond. Potassium channels then open, K⁺ flows out, and the membrane repolarises. The signal — that brief electrical wave — travels down the axon at speeds between 0.5 and 120 metres per second depending on whether the fibre is insulated with myelin.
This is physics. Hodgkin and Huxley won the Nobel Prize in 1963 for mathematically describing it. The equations they wrote describe every nerve impulse that has ever fired in every human nervous system. The same equations describe the electrical activity of the heart, the gut, the uterus. What they did not describe — because the data was not there yet — is how these equations change when the cells running them are exposed to estrogen.
Estrogen rewrites the heart's ion channel expression. A study published in BMC Cardiovascular Disorders found that estrogen upregulates L-type calcium channels (Cav1.2α) and sodium-calcium exchangers (NCX1) in the human left ventricle through genomic mechanisms — meaning estrogen literally changes which ion channels your heart muscle cells express. These channels are responsible for calcium handling and cardiac repolarisation. The consequence is a longer, more variable action potential duration in the female heart — and a higher susceptibility to drug-induced arrhythmias when those channels are blocked by medications tested predominantly on male hearts. [1]
The QT interval is longer in women — and it fluctuates with the cycle. A consensus document from the European Heart Rhythm Association confirmed that women have a physiologically longer QT interval than men, a difference that emerges at puberty (when estrogen first begins modulating cardiac ion channels) and narrows after menopause. The QT interval fluctuates measurably across the menstrual cycle — longer in the late follicular phase when estrogen peaks. A 2024 study established that sex hormones at physiological concentrations are sufficient to account for the observed sex-specific susceptibility to long-QT linked arrhythmias. Women are at higher risk of life-threatening cardiac arrhythmias under conditions that prolong the QT interval — including dozens of drugs that were developed and tested on male physiology. [2,3]
Women's nerves conduct faster in the upper limbs — despite being smaller. A 2024 study published in Diagnostics measured nerve conduction velocity and cross-sectional area in men and women across upper and lower limbs. Women showed significantly higher conduction velocity in the ulnar nerve despite a significantly smaller nerve cross-sectional area. In classical physics, smaller diameter should mean slower conduction in unmyelinated fibres. The female nervous system compensates through different ion channel expression, different myelin organisation, or both. The exact mechanism is still being worked out. What is clear: the female nervous system is not a smaller version of the male nervous system. It is differently configured at the cellular level. [4]
Pain signals travel differently in the female body. C fibres — the slow, unmyelinated fibres that carry persistent pain signals — display a phenomenon called activity-dependent slowing: with repeated stimulation, they conduct progressively more slowly, which normally dampens the input to the spinal cord. A study published in Journal of Neuroscience found that this protective slowing is reduced in females during inflammation — meaning that in the female nervous system, inflammatory pain signals are transmitted to the spinal cord with less attenuation. This is not women being more sensitive. It is women having a different electrical architecture in their pain-processing fibres — an architecture that, in the context of chronic inflammatory conditions, amplifies rather than dampens the signal. [5]
Every drug that blocks a cardiac ion channel was calibrated against a male heart. Every reference range for the QT interval was built from male data. The female heart has been beating to its own electrical frequency all along. We just were not told to measure it differently.
The Heart's Electrical Signature
Toggle between male and female ECG — and see what the QT interval difference actually looks like on the trace
Everything described so far — the action potential, the cardiac ion channels, the QT interval — involves electricity in a system with clear structure: a neuron with its axon, a heart with its chambers and its pacemaker. The sinoatrial node fires. The electrical wave propagates in a defined direction. The AV node delays it briefly. The ventricles depolarise. The heart contracts. Every beat follows the same choreography, conducted by the same conductor.
The uterus does none of this. The uterus has no sinoatrial node. No pacemaker. No defined conduction pathway. It is an organ the size of a fist that, when the time comes, needs to coordinate the simultaneous contraction of hundreds of millions of smooth muscle cells — all of them firing in synchrony, all of them oriented in the same direction, all of them producing the force required to move a human being through the world. And it does this without a conductor. Through physics alone.
The Uterus in Labour
Drag the slider to increase gap junction coupling — watch individual cells find each other electrically and begin to synchronise
Women have a longer QT interval than men. This is a measurable, consistent, hormonally driven difference in cardiac electrophysiology. More than 50 commonly prescribed drugs can prolong the QT interval — including antibiotics, antihistamines, antidepressants, and antipsychotics. Women are two times more likely than men to develop Torsades de Pointes, a potentially fatal arrhythmia, as a side effect of these drugs. This is a known risk that was not discovered until after the drugs were already in widespread use — because the trials that approved them used male subjects.
The sex differences in pain signal transmission are not psychological. They are in the ion channels of individual C fibre neurons. Female pain fibres in inflammatory conditions carry signals to the spinal cord with less attenuation than male pain fibres. This is not greater sensitivity — it is different electrical architecture. Understanding this at the cellular level changes how chronic pain in women should be treated. Treatments that target the specific ion channels involved in female C fibre conduction exist. They are underfunded and underexplored, in direct proportion to how long the pain was dismissed.
The uterus in active labour achieves something that has no direct equivalent in the rest of the body: coordinated, directional, rhythmic electrical activity across an entire organ, without a pacemaker, through gap junction-mediated self-organisation. The mathematics of this — how millions of cells, coupled only by protein channels 1.5–3 hours old, find a shared rhythm — is still being worked out in theoretical models published in 2024 and 2025. The uterus is not a simple muscle. It is a distributed electrical computing system. And it has been treated, historically, as a plumbing problem.
I spent nineteen years not knowing why I was exhausted. The answer, when I found it, was a genetic condition that reduces haemoglobin — the molecule that carries oxygen to cells, including the cells that run the sodium-potassium pump that maintains the resting membrane potential that makes everything else possible. My fatigue was not character. It was not laziness or anxiety or any of the other things it was implicitly attributed to. It was physics. The pump had less fuel. The signal was quieter. The electricity dimmed.
Understanding that did not give me back nineteen years. But it changed something — the way a correct diagnosis always changes something. The body stops being an obstacle and starts being a system. A system you can understand. A system whose rules you can learn. A system that, it turns out, runs on the same physics that governs everything in the universe — just expressed, in the female body, in a way that medicine is still catching up to.
You are not just biological. You are electrical. The voltage across your membranes is real. The signal travelling down your nerves is physics. The way your heart repolarises, the way your pain fibre slows, the way your uterus one day might coordinate itself into the most extraordinary act of self-organised electricity in biology — all of it is measurable, all of it is specific, and all of it deserves to be studied with the same rigour and the same funding as every other system in the human body.
You are electric. And you always were. Love, Nina ❤References
- Pham, T. V., et al. (2017). Genomic upregulation of cardiac Cav1.2α and NCX1 by estrogen in women. BMC Cardiovascular Disorders, 17, 139. https://doi.org/10.1186/s12872-017-0566-4
- Boorsma, E. M., et al. (2018). Sex differences in cardiac arrhythmia: A consensus document of the European Heart Rhythm Association. EP Europace, 20(10), 1565–1607. https://doi.org/10.1093/europace/euy046
- Kurokawa, J., et al. (2016). Sex hormonal regulation of cardiac ion channels in drug-induced QT syndromes. Pharmacology & Therapeutics, 168, 23–28. https://doi.org/10.1016/j.pharmthera.2016.09.004
- Nobue, A., & Ishikawa, M. (2024). Sex-specific differences in peripheral nerve properties. Diagnostics, 14(23), 2711. https://doi.org/10.3390/diagnostics14232711
- Dickie, A. C., et al. (2017). Inflammatory pain reduces C fiber activity-dependent slowing in a sex-dependent manner. Journal of Neuroscience, 37(27), 6488–6509. https://doi.org/10.1523/JNEUROSCI.3816-16.2017