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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Life & Death

10 September 2024

4 min read

A covering of feathers for the terrors of the night

How to struggle with the burden of other people's suffering.

Katherine Amphlett

Katherine is a counsellor based in the West Midlands.

Evie S. on Unsplash.

It’s one of the sad facts of life: that many of us at some point will see our parents get old and fade away. Sigh. It doesn’t matter how well prepared you are or how much you’ve thought about it before hand, the reality of a fragile mum or an exhausted dad can break your heart.

I’ve talked to my parents about this for years here and there. We’ve done lots of joking about seeing them off with a pink pill in the sherry, or ‘it’ll be a pillow for you Pa, if you’re too annoying’ – type thing. But when they left after Sunday lunch a couple of weeks ago, I had to clutch my husband. He lost his own mother last year… we’re still fluttering around the gap she’s left in our family. And now there’s my beloved olds too, looking diminished and moth eaten and moving at crepuscular speed. Ask Dad how he is these days, and he says ‘Old, dear’, and won’t elaborate further.

I can cope with this when it’s in short bursts. Visiting them for lunch or taking them out on a trip is OK and manageable, and there is still joy in family occasions. Mum’s birthday was full of love, even though she took all afternoon to open her cards and became hopelessly confused about who’d given her what.

But staying with them… that’s hard. Seeing the dust thick over the spare room; worrying about just how long that bowl of leftovers has been in the fridge. I whip about as unobtrusively as I can, scrubbing the bottom of the washing up bowl or putting their jerseys in a wash. I don’t want to be annoying – they won’t accept help and I’m not going to push – but it makes me sad. In particular I hate that my mum is in constant pain from crumbling bones, and that dementia has stolen her mind. Also, that as a consequence, Dad is irritable with her; he who has always adored her so much.

I could picture them vividly, the feathers, soft and heavy and beautifully patterned like an owl’s, and imagine I was peering out through them at Mum’s pain.

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Since childhood, I have struggled with the burden of other people’s suffering. I sometimes wonder if I’m exaggerating when I think about how much I mind, but I don’t think I am. I can only manage if I’m really ready for it. With my counselling clients that takes the form of very firm boundaries, regular supervision, colleagues to talk to etc… but with family it’s much harder. It’s just your own naked, soft-bodied self-shrinking from all the nettles and thorns – like a hermit crab without a shell.

So when I went down to Mum and Dad’s this time, I felt the need to prepare. ‘Put on the armour of light,’ St Paul says, which sounds just the thing. I hardly slept last time, tossing and wriggling through small-hour horrors with my neck hurting and a feeling of tears not being far away. What to arm myself with though?

The answer came in the form of an ancient poem - Psalm 91. I was listening to a Premier Radio presenter who is a pastor – a big, tattooed fellow with rings in his nose and lip – and he said it was his main defence when his wife was diagnosed with cancer. So, I looked it up, and I loved it. It was all about how the Lord will cover you with his wings and keep you safe from the terrors that visit in the night and the pestilence that stalks by day, or words to that effect.

Malcolm Guite (a poet and priest whose writing I love) says you have to treat Psalm 91 with care: it was the one Satan tempted Christ within the wilderness, challenging him to throw himself from the temple roof and God would send his angels to catch him (as it says in the psalm). It’s not to be taken literally, this psalm: you can’t deliberately put yourself in harm’s way and expect to be immune because you’re a Christian, like some of the vehement anti-vaxxers around the world who think faith alone will protect them from lethal diseases. But the message is that if you put your trust in God, he won’t let you be damaged in any important or lasting way by the evils of the world.

I memorised as much of it as I could. And then when I woke in the night – inevitably – with the dread hovering over me, I kept thinking, ‘The Lord will cover thee with his feathers’. I could picture them vividly, the feathers, soft and heavy and beautifully patterned like an owl’s, and imagine I was peering out through them at Mum’s pain and muddliness and Dad’s frustration and my own fear. They were like malevolent ghosts drifting through the dark, menacing and cruel. But Mum and Dad and I, our actual selves, were curled up safely, warm and hidden with the great wings over us.

And eventually, I was able to go back to sleep.