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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Sport

20 August 2024

5 min read

What’s Simone Biles doing today?

How to live with winning and losing.

Julia Kendal

Juila is a writer and social justice advocate.

Simone's gold medal moment.

@simonebiles

I wonder about what Simone Biles is doing today. She is one of the many athletes whose Paris 2024 was about more than gold; it was about redemption. Now the Games are over, what happens to their restoration story?

The narrative about redemption seemed to dominate the headlines and linger in post-event interviews. Some Olympians came to the Games seeking it. Gymnast Rhys McClenaghan was tipped for gold in Tokyo 2020 but stumbled on the pommel horse, finishing in seventh place. In France, he climbed to the top of the podium.

Others completed a fall and rise within the two weeks themselves. Sprinter Jeremiah Azu had a faltering beginning to the Games, disqualified for a false start in the individual 100m heat. Just six days later he was clutching a bronze medal for the relay.

Then there are those like taekwondo athlete, Jade Jones, who also laboured for years and gave their all – but didn’t get the payoff that they sought. What does the story mean when it is unfulfilled? And when the Games are over, how do people live with winning and losing?

Into our messy, maybe frightening, sometimes ordinary, lives, we love a redemption story to brighten and neaten things up.

After years of professional procrastination, a few months ago I finally took the plunge and joined LinkedIn. An impressive feat, I know. It was driven by practicality; I was finishing a job as a climate policy advocate and making the leap into consultancy. But I’ve been fascinated to discover how people in my community, and millions of others, are sharing tender and vulnerable ideas and thoughts in this social workspace. They are coming with questions – what does success look like? How are you navigating your purpose in the day to day? What world do you want your children to inherit? – and gentle ideas about their answers.

People are asking about and reflecting on how to navigate winning, and losing, and living in the murky space in between.

This feels striking because one of the other prevalent stories many of us believe, maybe unconsciously, is that life will generally be good and any setbacks are the exception. Growing up in the Nineties the message seemed to be: the world is your oyster if you work for it. Put in the effort, and the losses will be few and the trajectory will be up.

But the last few years in particular – economic volatility, growing exposure of deep inequalities, the worsening climate crisis – hammer home that this is not reliably the case. No matter how much effort you put in, we rarely live through one type of season at a time. Joy and suffering co-exist. And amongst the highs and the lows, there is a whole lot of everyday living. Show up at the desk, the school gate, the supermarket.

Into our messy, maybe frightening, sometimes ordinary, lives, we love a redemption story to brighten and neaten things up.

The sting of winning or losing is softened when we stop ascribing all meaning to them, and instead cast them in the context of a wider story.

But part of the problem with many of the redemption tales we share is that they rely on the person themselves to deliver their own restoration. They’ve had (and are perhaps blamed for) a fall from grace, and now it’s up to them to find it within themselves – their physical, mental and emotional capacity – to achieve restoration. That’s a heavy weight to put on anyone’s shoulders (however broad they may be).

And any redemption gained is fleeting. Medal winners talk about ‘gold medal syndrome’: the post-competition feeling of depression, loneliness and emptiness. For those athletes who’ve now headed home after fulfilling a salvation arc, is the emotional dip going to be even steeper, harder?

Most of us won’t be Olympians, despite how expertly we discuss the diving scores every four years, but that sense of deflation after achieving a long-sought goal can be resonant. We’ve strived and risked ourselves for something, only to find the aftertaste is a bit flat. That new job is good but flawed. Winning that award doesn’t stop a rejection landing in the inbox the next day. The house renovations are already showing cracks. Winning and losing are both transient. A redemption made ourselves rarely satisfies or lasts.

The sting of winning or losing is softened when we stop ascribing all meaning to them, and instead cast them in the context of a wider story. One that goes further than a single person or moment – a birth, a podium, a bonus. Such a story can speak beyond our own lives to the core challenges we face in the world: fairness into a broken economic system; peace instead of violence in our communities; flourishing, not escalating environmental crises.

During my years of climate advocacy, I have sometimes envied colleagues working on more tightly defined topics with the possibility (only fulfilled through huge amounts of wisdom and graft, of course) of winning. Change a law, solve a problem. As the climate gets warmer and more unpredictable, it’s easy to have a sense that, at best, you are just making things a little less bad. The wins are in the context of a lot of disappointments, and a whole lot more grey space in between.

But by being able to root my day to day in a bigger story, I can move forward with hope. Understanding our lives as part of an even greater narrative – the story of this world that God loves and sustains and restores – saves us from the pressure and heartache of trying to redeem our own lives. Instead, we can live them – the wins, the losses, and all the mundane moments in between – in light of that bigger story.

Looking at the world through the lens of God’s redemption story helps us to stay clear-sighted: celebrating the successes and not make them our whole world; naming the problems and still acting with hope and grit.

A redemption arc is a beautiful one. I want to hold onto that longing, but find it in a story that’s deeper, longer and richer than I can see. A story that lasts.