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Awe and wonder

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7 September 2023

6 min read

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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Sustainability

Wildness

12 June 2025

5 min read

What my noisy, messy crow neighbours have taught me about how to live

We can’t control nature; we just need to become more porous to it

Joel Pierce

Joel Pierce is the administrator of Christ's College, University of Aberdeen. He has recently published his first book.

Meet the neighbours.

Townsend Walton on Unsplash.

Our neighbours hate our crows. I can’t blame them. The hundreds of crows that occupy the tops of the ancient pines which surround our rural manse are the noisiest and messiest residents I have ever lived near. They greet each sunrise with a din of caws and counter-caws, as if they are deeply concerned that anyone might miss this momentous daily event or the fact that it’s now happening before 5:30a.m. In nesting season, which lasts most of April and May, our car is easily identifiable in any carpark by the crusted grey spots with which the crows see fit to adorn it. Within a week of moving in, we gave up on the washing line so invitingly strung between two of the pines. Our pristine whites were too tempting a target for our crows.

I do not attend the meetings of our local community council, but I hear whispers of what transpires there. Our crows, evidently, have been a regular topic of conversation. Multiple solutions have been proffered for driving them away. All have been tried and all have failed. Our crows cling fiercely to their homes and their determination is more than a match for any human efforts. If I have the vibe of my community right, at least some of its members feel that there’s something perverse, obscene even, about a flock of birds being allowed to upset our human right to create a serene, comfortable, and convenient habitation. Our clump of houses is surrounded by a visually stunning landscape; shouldn’t the aural landscape be equally beautiful?

If my family does not mind our crows, it is because the treetop drama is just one more example of many natural encroachments on the house, some more welcome than others.

Every year we celebrate the miraculous return to our eaves of house martins, home from their intercontinental peregrinations. We look forward to another summer spent watching their acrobatics and listening to their chicks in the nests an arm’s length from our windows.

Clearing up the mess of our attic’s bats is an annual chore, one thankfully performed stoically by our church’s property convener, but there are compensations - such as the twilight shows they put on outside our living room window, performing impossible turns and reversals midair in their search for prey.

Less welcome are the massive spiders, which are a perennial presence; the slugs, which seemed to apparate onto the hall carpet all through winter, the mice, two of whom sacrificed themselves to knock our dishwasher out of action by chewing through its hose; and the wasps who built a nest the size of a telephone box in the roof space above our back bathroom.

Least fun of all has been what we call the Great Earwig Migrations, which have happened twice in our half-decade in the manse and which involve weeks of finding the little bugs under, seemingly, every object and on every surface.

When we moved into the manse, we expected challenges, the high heating bills, the leaking roof, and the isolation of the countryside. What we did not expect was the experience of porousness; the shock of realising that we had so little control over what other forms of life saw fit to share our habitation with us.

At first it felt to me perverse, obscene even, that a house, even a 120-year-old house, should be so vulnerable to incursions by animal creation. Shouldn’t our home, our space, be a haven where we can control who or what enters, who or what we feel comfortable with, and who or what we can exclude?

If I had to give a name to this expectation, maybe it would be that of the buffered home, a play on philosopher Charles Taylor’s description of the modern self as buffered. Taylor contrasts the selves we aspire to be in modernity, ones able to control and order our bodies, our space, our lives, and our relationships so that they accord with our autonomous desires and actions, with those of our premodern ancestors. Medievals and ancients assumed porosity. Bodies were subject not just to biological infection, but spiritual infections too. Projects and plans were frustrated not just by mistakes or personal failings, but by the ever-fickle whims of the goddess Fortuna. Their lives, their bodies, their homes, existed in a perpetual state of vulnerability. The threat of everything falling apart was always on the horizon.

We want nature to survive, flourish even, but not at the cost of our comforts or our sense of autonomy and security.

Modern technology has helped us tame the more unwelcome of these forces, but it has also given us an overly naive expectation that all that is inconvenient about nature can and should be gradually eliminated. This expectation frames the way we respond to worries about climate change and other creeping environmental crises. We want nature to survive, flourish even, but not at the cost of our comforts or our sense of autonomy and security. But as our ancestors might remind us, we are part of nature too, and, just as in any relationship, mutual vulnerability and sacrifice are needed if we are all going to survive. This is scary, but there are resources within Christianity - within other faiths too - to help us understand that there are benefits to affirming our vulnerability, our porosity.

My daughters love our crows. They point in wonder as the crows flood into the sky at dusk, hundreds of them making a giant circle once, then twice round the garden, before settling down for the night. When, in late May, grounded fledgings appear, bundles of feathers shocked at the sudden inhospitality of the nest, too stunned to realise they can fly home, my daughters watch over them, anxious lest the local cats take advantage of their bewilderment.

A few Sundays ago, my youngest, who struggles to stay quiet and well-behaved in Sunday School, pulled me out of church early. We sat on the church lawn staring up at the crows and soon were adapting the andante melodies of that Sunday’s hymns into imagined songs of praise that crows might sing. “No,” my youngest said, simpatico with the crows as she is, “I think they’d want something more upbeat.” And so we tried setting our own corvid-themed praise lyrics to Rosé and Bruno Mars’ song APT, while listening to the caw and counter-caw above. “Dad, how do you think God sees the world?” she asked me when we finished. I stumbled through my best theologically informed explanation of how God could be in every part of creation without being of it, before she stopped me. “I think it’s like a giant snow globe that he holds in his hands.” Watching the birds swirl around us, two stationary figures caught by the same currents of air that were sweeping them aloft, what could I do but agree?

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