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.

Article

Advent

Awe and wonder

Creed

Wildness

22 November 2024

4 min read

Why does snowfall still awe us?

We long for snow this time of year because longing is all there is to do.

Josh Richards

Josh is a curate in London, and is completing a PhD in theology.

Durham Cathedral.

Jeffrey Zhang on Unsplash.

Why are we so drawn to snow? And what does it say about us that we are? The German theorist Hartmut Rosa begins his wonderfully titled book The Uncontrollability of the World with these words:

"Do you still remember the first snowfall on a late autumn or winter day, when you were a child? It was like the intrusion of a new reality. Something shy and strange that had come to visit us, falling down upon and transforming the world around us, without our having to do anything. An unexpected gift. Falling snow is perhaps the purest manifestation of uncontrollability. We cannot manufacture it, force it, or even confidently predict it."

Rosa argues that we find greatest meaning in that which remains uncontrollable, beyond our grasp. We long for snow this time of year because longing is all there is to do. Artificial snow will always disappoint. We cannot manufacture our own awe.

Rosa warns that modernity is built around "the idea, the hope and desire that we can make the world controllable." At a certain point more influence over something results in that thing being reduced to a mere instrument capable only of frustrating our desires.

I sit down to watch a film that's finally streaming. It gets a bit slow 20 minutes in. I start watching something else. I wonder if I should have seen the film in the cinema.

I catch up with the podcast of the event I decided not to go to. I speed it up as I put the washing in. I couldn't tell you what they discussed.

I turn to social media as one might turn to a snow globe. In its careful curation, all I feel is the ache for the real thing.

In each of these cases, technology has, at least on one level, given me greater control and allowed me to shape my environment in greater accordance with my desires. Rosa identifies that all desire is “driven by a longing to bring something as yet unreachable within our reach.” And yet, in each case, that which I desired—the experience of watching a great film, participation in a stimulating conversation, meaningful human connection—is jeopardised by this supposed improvement.

So, it makes sense that we are on the lookout for snow at this time of year. Something in each of us is still looking to be caught up in something beyond us.

What we think of as a drive to increase choice is often really about control. Putting it in these terms does not invalidate the drive but it should make us more alert to the cost. Greater choice for me means greater control over something or someone.

At the same time, greater control over the environment can also mean less self-control. I am a bundle of contradictory desires, and the more I am empowered and encouraged to pursue all of them, the more I am empowered to pursue none of them consistently. (I still haven't finished Inside Out 2)

The self-frustrating desire that Rosa identifies sits at the heart of so many of the most important debates from artificial intelligence to assisted dying. Control can be conflated with dignity or fulfilment. As uncontrollability is marginalised so too do we risk marginalising that which makes life worth living.

In the season of Advent, Christians remember the birth of Jesus, but its primary purpose was and is to direct our gaze to the end of the world. We might be able to sentimentalise and sanitise the Christmas story, but Advent's apocalyptic summons will always resist our desire for control. It proclaims that we are going to die, that the world will end, and that we will all be judged. You are not in control.

No matter how exhaustive and efficient we believe our control to be, Advent reveals it to be a pretence. There will always be things beyond our grip, and we spend a great deal of time distracting ourselves from them, pretending that it is otherwise.

Advent assures us that we can face this reality because we do not so alone. The God who came as a baby and was executed, experiencing the extremes of human vulnerability, is with us now. It is that God who comes at the end. It is that God whose love gives us comfort and courage.

So, it makes sense that we are on the lookout for snow at this time of year. Something in each of us is still looking to be caught up in something beyond us, something that no technology or system can organise or tame. Snow then acts as an echo of that more profound sense of vulnerability that we are each tempted to avoid. It stirs up our longing to be confronted with something genuinely awe-inspiring.

In the wildness of Advent, we find the promise of what we have longed for: a God who will come and restore all things, an uncontrollable God who comes like snow. Advent calls us to put down the manmade slush and prepare for the coming blizzard. Doing so might help us see where this new reality already intrudes.