The heart of the matter

Heart doctor Michael Henein steps back to consider the unseen and unique wonders of the human body’s design.

Michael Henein

Professor Michael Henein is a consultant cardiologist, and a Professor of Cardiology at Umea University, Sweden.

A model of a human heart on a short stand.

Photo by Jesse Orrico on Unsplash.

Shakespeare famously asked:

“What a piece of work is a man, how noble in reason, how
infinite in faculties, in form and moving how express and admirable, in action how like an angel, in apprehension how like a god! the beauty of the world, the paragon of animals—and yet, to me, what is this quintessence of dust?

Humans may be complex, capable of great heroism and deep depravity, yet it is worth stopping for a moment to look at the human body and mind to marvel in what we have become, and how we are made.

The visible design of the human body points out common features shared along with other members of the animal kingdom. Examples of these features are: two eyes, two ears, two nostrils, one mouth and four limbs, attached to a body and head. Detailed study of different seen parts of the body may, however, show some differences. For example, the presence of fingers and nails, hair distribution as well as a developed tail. While most members of the animal kingdom have teeth and a tongue, those two could also vary in their number and size, respectively, according to different species. Genetic investigations have shown that we humans share 99 % of our genes with animals, suggesting that our “earthly” component shares a common origin. Indeed, the twenty first century scientific findings match what is written in the Genesis story of creation, a story written over 3,500 years ago, well before genetic sciences came to light.

Creatures great and small

As for morphological differences between animal species, it is difficult to naively conclude why some are wild while others are man-friendly-even if the wild ones have different shapes, design, dietary habits, body size and life span. Other important observed features of the members of the animal kingdom are that they are all born, they all age, then ultimately die.

If we are to look at the unseen features of the members of the animal kingdom, we can again identify similarities. For example, all have a gastrointestinal tract, a cardiovascular system, a reproductive system, a respiratory system, a urinary system and much more. While these systems may differ slightly between species, the overall structure and function achieve similar purposes. For example, heart speed is faster in small animals like rats compared to big ones like elephants who have very slow hearts. Likewise, the respiratory system and the number of respiratory cycles per minute are significantly faster in running animals compared to the sedentary and slowly moving ones. Finally, the number of offspring also differs in different species, being just one at a time in big animals like elephants and horses, and many offspring in small animals like rabbits and mice. Such paradox between the number of offspring and animal size makes you think of the important determining role of the activity of those animals.

Unseen wonders

Now to turn to the rest of the animal kingdom and the unseen features of the human body. To start, let us look at the amazing functions of the human brain and its various functions. When humanity is sometimes described as the crown of creation, such a description is based on the superiority of human brain function and skills. Its sophisticated structure and how vital centres are created deep in the skull, to be protected from traumas, make you marvel. Also, the brain controls the different functions of the whole body, with its sensory and motor activities, various vital system functions including the lungs and the heart, all endocrine glands’ function, in addition to various receptors and centres that allow utmost precision and accuracy in everything we do. An example of this kind of precision is a doctor feeling a vein or an artery with the tip of a finger to insert a needle or a musician moving a finger a few millimetres while playing a violin, to produce the exact sound needed. Furthermore, the integrated function of human muscles, nerves and spinal cord is also amazing, let alone the synapsis between the nerve endings and muscle bundles, the chemicals secreted in them which allow electric stimulus transmission from the nervous system to achieve the motor function and desired movement.

The human brain also has the unique feature of storing knowledge. Of course, we should not ignore the importance of the training and programming ability of human brain. We learn how to drive a car, how to play games, how to study, how to operate safely on a sick patient. Such acquired skills are quite limited in other members of the animal kingdom. Moreover, the human brain has the unique ability to invent, discover, improve and correct errors it identifies.

Another very unique feature of human brain is its ability to conduct speech, a feature of humans that is under-developed in other members of the animal kingdom. While most animals can make noise and sounds, only humans can articulate words, sentences and even sing very complex songs. This unique ability seems to be the underlying mechanism behind the development of languages which are based on the human ability to talk and transmit information and knowledge by words and phrases.

The unseen brain has allowed human life to develop over time, building skills and achievements from generation to generation. Millennia ago, humans lived in huts together with animals, and now they build houses and palaces to live in. Centuries ago, we used donkeys, horses and camels to travel but now we use cars, trains, ships and airplanes. Our ancestors burned wood and coal to cook and to warm but now we use electricity to do these.

When we look carefully at the unseen parts of the human body, we also realize that we cannot alter any of it, despite the scientific advances made over the years. We can understand what harms our body and take measures to avoid it. Out of the ability of our brain to discover and invent, we have now produced science-based means for curing various diseases. Consider how we can replace a dysfunctional heart valve or a mobility-limiting joint. These inventions have resulted in a better quality of life, alleviating of symptoms, even helping to avoid early death, in some cases such as heart disease and cancer.

The heart of the matter

Another unseen source of life in humans is the heart. This fist-size organ is so complex in its structure and function. Recent scientific advances have enabled us to study heart function in milliseconds, hence the development of pacemaker treatments. They have also allowed clear imaging of the inside of the heart and the identification of pathologies, developments that guide practitioners to the optimum treatment of heart conditions. Recent discoveries have also allowed us to better understand how people develop coronary artery disease and how the pathology starts at the innermost layer of the arteries, particularly in individuals carrying significant risks for atherosclerosis including, smoking, high blood pressure, diabetes, high cholesterol and obesity. Amazingly, obesity has been shown to be the strongest underlying cause of other risk factors, hypertension, diabetes and hypercholesterolemia. So, nature cannot be blamed in many of these patients but our own patterns of behaviour. Science has shown that walking at least 5,000 steps each day, complying with the design of our body, reduces the likelihood of developing coronary artery disease by 15 per cent.

The unseen physiology of the rest of our body systems and the interaction between systems make us wonder how we are made. A rise of our body temperature by one degree due to a bug infection affects all body systems from the brain to the heart. A virus which cannot be seen by the most powerful microscope can destroy our lungs and cause premature death, as was the case with COVID-19 and others.

Finally, human inventions in the form of powerful microscopes have allowed scientists to study the human cell, which is the smallest living component of our body. Such small cells cannot be replicated in any factory in the twenty-first century, despite the vast scientific developments that surround us. You'll be surprised to learn how complicated and meticulously fine-tuned a human cell is and also how it functions, connects with other cells and other parts of the body. An example of this is the interaction between body minerals, calcium, sodium and potassium with heart and muscle individual cells. Such a function is critically controlled by many factors such as time, electric stimulation and pressure differences producing remarkably harmonious contractions and relaxation of the muscles without missing a beat.

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Nationalism

17 September 2025

5 min read

I protested against the Unite The Kingdom protest

The need to see one another

Thomas Sharpe

Thomas is a writer exploring the intersection of faith, politics, and social justice.

CCTV footage show two rival protests divided by a line of riot police.

CCTV image of the rival protests on Whitehall.

Met Police.

I don’t know why I was so concerned about the horses. I kept noticing them swaying through the sea of shivering bodies. I was so drawn to them that I tried to take a photo, a rare occurrence for me, but I was too far away. The horses riders, dressed in full riot gear, were being pelted with beer bottles. Maybe the horses were getting hit too, but it felt like they were recoiling on behalf of their riders.

In front of the horses, engulfing Trafalgar Square, were tens of thousands of “Unite the Kingdom” protestors. From what I could see, they were predominantly white men. Many of them were dancing and waving flags, but a sizeable contingent was furious, drunk, and insisted on attacking any unfortunate police officer in their way.

Behind the horses, lining the streets of Whitehall, were five thousand counter-protestors, including me. Unlike our opposite numbers in Trafalgar Square, we were trapped, surrounded on every side by St George’s flags, Union Jacks, and, oddly, some Georgian flags too. Maybe the shop had sold out. To my right, I could see the counter-protestors defiantly dancing. To me left, I could see a group chanting “Nazi scum, off our streets” whilst swearing towards the St George’s flags.

There in the middle, I found myself feeling a curious mixture of discomfort, sadness, and anger. Uncomfortable because I’d been trapped for four hours, stuck on a continuous cycle of rinse and drain. Sad, because I knew that much of the “Unite the Kingdom” violence was built on misinformation and the scapegoating of refugees, a group I know well, and because this fog of violence blew over the counter-protestors as they hurled insults towards the St George’s flags. And angry, because figures like Elon Musk were using their extraordinary wealth and influence to spread fear and lies: “Whether you choose violence or not, violence is coming to you. You either fight back or you die. You either fight back or you die. And that’s the truth. It’s only a matter of time till that happens to towns and villages. It will spread. And no one will have any peace.” Over the years, I have spent many hundreds, if not thousands, of hours with refugees and asylum seekers, both in my home and at my church. I had experienced no violence. In that moment, I was surrounded by “leftists”, socialists, and trade unionists, and the only violence I was experiencing was from the glint of beer bottles raining down on the police two hundred meters away.

I was grateful for the interruption of an elderly lady asking if she could get past. I’d been asked a number of questions throughout the day, primarily because I was one of a group of four Christians holding signs like “Jesus was a refugee”, “love thy neighbour”, and “I was a stranger and you welcomed me”. At the start of the protest, an older lady and a young man joined our circle. The young man asked “I’m glad to see there are some Christians here. What do you think of Christian nationalism? Your religion doesn’t feel much like Jesus?” He was a brave Saudi Arabian refugee with a bright smile, earnestly questioning the fractures in my community of faith. Taken aback by the poignancy of the question, I fumbled a response before being rescued by one of my friends.

Protest signs written on cardboard. — *Tommy's protest signs before the rain.*

After a while, the older lady started speaking. “Sorry for interrupting. I used to be a Roman Catholic, but I’ve lost my faith. On days like this though, I always want to pray. I don’t feel much hope for the church. A while ago, I went into a catholic church. I asked if the church could do anything about the divisions in our community and the anger at refugees. The priest shrugged and said no. I’m glad you’re here.” Her short, staccato sentences mirrored the tension of the day. I told her about how our church serves refugees, how I struggle with the anger of days like today, and how some of us have forgotten that the bible tells us to welcome the stranger dozens of times. As they walked away, I felt touched by the honesty both the young and old had gifted to four strangers, and I was glad to be carrying our smalls signs of hope.

The megaphone brought the present back into view with another question. “Could everyone please get ready to leave up the left of Trafalgar Square?” it said. The police had cleared a path for us to leave, the sea of flags artificially parted by riot gear. We were escorted to Green Park tube station, at which point we turned off towards Oxford Street. My wife remarked at how quickly normality returned. I was devastated by the day, but felt too tired to weep. I wasn’t quite the same Tommy that I’d been that morning. The man who shares my name, and the chaos he wrought on my city, had turned a dial in me a little further than it had been turned before.

I knew that I would have more days like this. In the midst of my discomfort, sadness, hope, and fear, I knew that I was supposed to be there, holding my soggy “Jesus was a refugee” sign, shivering in my damp clothes, and praying under my breath. I knew that I needed to gather other reluctant protestors alongside me, holding their own soggy signs and praying their own prayers.

And I also knew that there was a better way to carry this fragile message of unity in our increasingly fragile land and increasingly fragile time. As a half-British, half-South African man, I’ve had the privilege of growing up with the stories of the anti-apartheid movement, stories which steward the hard-earned truth that defiant, tenacious, persistent love is the only antidote to hatred, misinformation and fear. As Desmond Tutu once said, “when we can accept both our humanity and the perpetrator’s we can write a new story”. Saturday left me feeling that we desperately need a new story, and that requires us to look beyond the swaying horses and see one another clearly.

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