Potassium: Regulator of Heart Contractions
Potassium (K)
For humans – the formula for health: potassium – for soft tissues, calcium – for hard tissues.
In the human body, potassium participates in intracellular metabolism, regulation of heart contractions, and water-electrolyte balance, is an important regulator of metabolism and osmotic pressure, and is involved in the activity of the nervous system. It is potassium that facilitates the transmission of nerve impulses from neuron to neuron.
The body maintains a constant level of potassium, with a daily requirement of 2–5 g.
In the USA, the recommended minimum daily intake of potassium is set at no less than 2000 mg for individuals aged 18 years. For older individuals, this amount is increased by the number of years lived (for example, for individuals aged 50, this figure equals 2000 + 50 = 2050 mg).
The daily recommended intake of potassium for athletes and those engaged in heavy labor is 2.5–5 g.
The daily recommended intake of potassium for athletes and those engaged in heavy labor is 2.5–5 g.
The bioavailability of potassium in the body is 90–95%.
Potassium salts are easily absorbed and quickly excreted from the body via urine, sweat, and through the gastrointestinal tract.
The total potassium content in the body ranges from 160 to 250 g (about 0.23% of total body weight). In blood plasma, potassium levels are 15–20 mg%, while in erythrocytes, it is 450–480 mg%. Potassium is the main intracellular cation. Its concentration in cells is 30 times higher than that outside the cells. Potassium is primarily excreted by the kidneys, which is associated with its diuretic effect.
The total potassium content in the body ranges from 160 to 250 g (about 0.23% of total body weight). In blood plasma, potassium levels are 15–20 mg%, while in erythrocytes, it is 450–480 mg%. Potassium is the main intracellular cation. Its concentration in cells is 30 times higher than that outside the cells. Potassium is primarily excreted by the kidneys, which is associated with its diuretic effect.
Biological role in the human body. Potassium is one of the most important electrolytes in the body. Like sodium, it plays a significant role in the formation of buffer systems that prevent changes in the reaction of the internal environment and ensure its constancy. Potassium, along with sodium, regulates the water content inside cells. It supports the electrical potential in nerves and on the surface of cell membranes, which regulates muscle contraction. Potassium is involved in the mechanism of glycogen accumulation – the primary energy source in the cell. Potassium activates the activity of several enzymes.
Disruption of the potassium-sodium balance leads to disturbances in water metabolism, dehydration, and muscle weakness.
It is believed that potassium has a protective effect against the undesirable influence of excess sodium and also normalizes blood pressure. For this reason, in some countries, it has been proposed to produce table salt with the addition of potassium chloride. However, an excess of potassium relative to sodium can also cause disturbances in the cardiovascular system.
The main biological function of potassium is the formation of the transmembrane potential and the propagation of potential changes across the cell membrane by exchanging with sodium ions according to the concentration gradient. Together with sodium and chlorine, potassium is a constant component of all cells and tissues. In the body, these elements are present in a specific ratio and ensure the constancy of the internal environment. In the form of the cation K+, potassium participates in maintaining homeostasis (ionic balance, osmotic pressure in the body fluids). Potassium and sodium chlorides, being strong electrolytes, participate in the generation and conduction of electrical impulses in nerve and muscle tissues. Thus, potassium is involved in maintaining the electrical activity of the brain, the functioning of nervous tissue, and the contraction of skeletal and cardiac muscles. Potassium regulates the activity of such important enzymes as K+-ATPase, acetylcholinase, and pyruvate kinase.
The therapeutic significance of potassium is related to its irritating effect on mucous membranes, with an increase in the tone of smooth muscles (intestines, uterus), which is why its compounds are used as laxatives. Potassium causes the dilation of blood vessels in internal organs and constriction of peripheral vessels, which promotes increased urination. It slows down the heart rate and, acting similarly to the vagus nerve, participates in regulating heart activity.
Disruption of the potassium-sodium balance leads to disturbances in water metabolism, dehydration, and muscle weakness.
It is believed that potassium has a protective effect against the undesirable influence of excess sodium and also normalizes blood pressure. For this reason, in some countries, it has been proposed to produce table salt with the addition of potassium chloride. However, an excess of potassium relative to sodium can also cause disturbances in the cardiovascular system.
The main biological function of potassium is the formation of the transmembrane potential and the propagation of potential changes across the cell membrane by exchanging with sodium ions according to the concentration gradient. Together with sodium and chlorine, potassium is a constant component of all cells and tissues. In the body, these elements are present in a specific ratio and ensure the constancy of the internal environment. In the form of the cation K+, potassium participates in maintaining homeostasis (ionic balance, osmotic pressure in the body fluids). Potassium and sodium chlorides, being strong electrolytes, participate in the generation and conduction of electrical impulses in nerve and muscle tissues. Thus, potassium is involved in maintaining the electrical activity of the brain, the functioning of nervous tissue, and the contraction of skeletal and cardiac muscles. Potassium regulates the activity of such important enzymes as K+-ATPase, acetylcholinase, and pyruvate kinase.
The therapeutic significance of potassium is related to its irritating effect on mucous membranes, with an increase in the tone of smooth muscles (intestines, uterus), which is why its compounds are used as laxatives. Potassium causes the dilation of blood vessels in internal organs and constriction of peripheral vessels, which promotes increased urination. It slows down the heart rate and, acting similarly to the vagus nerve, participates in regulating heart activity.
The main functions of potassium in the body: maintaining the constancy of the composition of cellular and intercellular fluids, maintaining acid-base balance, ensuring intercellular contacts, ensuring bioelectrical activity of cells, maintaining neuromuscular excitability and conductivity, participation in the nervous regulation of heart contractions, maintaining water-salt balance, osmotic pressure, role as a catalyst in carbohydrate and protein metabolism; maintaining normal blood pressure levels, participation in ensuring kidney function.
Potassium carbonate was widely used for the treatment of many diseases by the founder of homeopathy H.F.S. Hahnemann (1755-1843). Modern homeopaths consider it necessary to use this salt in diseases of the cardiovascular system, respiratory tract (laryngotracheitis, bronchitis with severe morning cough, congestive bronchopneumonia with severe cough and poorly expectorated phlegm). This preparation is used to treat gastrointestinal diseases (gastritis with sour belching, aversion to food, nausea, craving for sweets, pressure and pain in the epigastric region), as well as constipation, flatulence, and hemorrhoids with lumps, bleeding diseases of muscles and joints – with pain in the arms, from the shoulder to the fingers, in the hip and knee joints, and soles.
Synergists and antagonists of potassium. The synergist of potassium is magnesium.
Excessive consumption of coffee, sugar, alcohol; corticosteroid medications, laxatives, colchicine, as well as stress hinder potassium absorption, while vitamin B6, sodium, neomycin facilitate this process.
Some diuretics, phenolphthalein enhance the excretion of potassium by the kidneys.
Sodium, cesium, rubidium, thallium have antagonistic properties concerning potassium and can displace it from tissues.
In the case of a deficiency of sodium and potassium in the diet, the content of lithium in the body increases.
Excessive consumption of coffee, sugar, alcohol; corticosteroid medications, laxatives, colchicine, as well as stress hinder potassium absorption, while vitamin B6, sodium, neomycin facilitate this process.
Some diuretics, phenolphthalein enhance the excretion of potassium by the kidneys.
Sodium, cesium, rubidium, thallium have antagonistic properties concerning potassium and can displace it from tissues.
In the case of a deficiency of sodium and potassium in the diet, the content of lithium in the body increases.
Potassium deficiency leads to disturbances in the functioning of the cardiovascular system and can cause muscle weakness. Prolonged potassium deficiency can lead to cardiac arrest.
Signs of potassium deficiency: increased skin dryness, acne, frequent colds, deterioration of mental activity, nervousness, insomnia, decreased reflex function, depression, constipation, diarrhea, edema, unbearable thirst, glucose intolerance, stunted growth, increased cholesterol levels, low blood pressure, muscle fatigue and weakness, nausea and vomiting, periodic headaches.
Signs of potassium deficiency: increased skin dryness, acne, frequent colds, deterioration of mental activity, nervousness, insomnia, decreased reflex function, depression, constipation, diarrhea, edema, unbearable thirst, glucose intolerance, stunted growth, increased cholesterol levels, low blood pressure, muscle fatigue and weakness, nausea and vomiting, periodic headaches.
Large doses of potassium cause cardiac paralysis. Excessive intake of K+ ions leads to overload of the corresponding homeostatic systems and disruption of metabolic processes. In the epithelium of the gastrointestinal tract and renal tubules, inflammation develops, often leading to tissue necrosis.
A constant excess of potassium and sodium causes a slight increase in insulin levels in the blood. Other hormonal disturbances are also noted.
A constant excess of potassium and sodium causes a slight increase in insulin levels in the blood. Other hormonal disturbances are also noted.
Accumulation of potassium in the blood, hyperkalemia (at concentrations above 0.06%) leads to severe poisoning, accompanied by paralysis of skeletal muscles; at potassium concentrations in the blood exceeding 0.1%, death occurs. Prolonged continuous use of potassium medications can lead to a weakening of the contractile activity of the heart muscle, which is why in such cases sodium preparations are prescribed instead of potassium ones. The development of hyperkalemia is facilitated by acidosis.
The main manifestations of potassium excess: increased excitability, irritability, anxiety, sweating; weakness and paresis of muscles, degenerative neuromuscular disorders; neurocirculatory dystonia; arrhythmias, weakening of the contractile ability of the heart muscle; paralysis of skeletal muscles; intestinal colic; frequent urination; predisposition to the development of diabetes mellitus.
The main manifestations of potassium excess: increased excitability, irritability, anxiety, sweating; weakness and paresis of muscles, degenerative neuromuscular disorders; neurocirculatory dystonia; arrhythmias, weakening of the contractile ability of the heart muscle; paralysis of skeletal muscles; intestinal colic; frequent urination; predisposition to the development of diabetes mellitus.
People with excess potassium are usually easily excitable, sensitive, hyperactive, suffer from increased sweating, and frequent urination.
Potassium is necessary: in cases of heart muscle insufficiency, heart rhythm disturbances, fluid retention in the body, hypertension.
Food sources of potassium: dairy products, fish, meat, including poultry; fruits, especially – cherries (ash content – 90–600 mg%): apricots, avocados, plums, pineapples, oranges, watermelons, bananas, grapes, cherries, pomegranates, melons, figs, kiwis, cornelian cherries, gooseberries, peaches, plums, red currants, black currants, feijoa, persimmons, sweet cherries, mulberries, apples; dried fruits: raisins, dried figs, dried apricots, dates, prunes; grains and legumes: beans, peas, buckwheat, corn, oats, millet, soft wheat, hard wheat, brown rice, wild rice, rye, soybeans, beans, lentils, barley; whole grains, bran; vegetables: ginger, potatoes, zucchini, white cabbage, broccoli, Brussels sprouts, kohlrabi, red cabbage, carrots, hot peppers (chili), radishes, black radishes, beets, tomatoes, parsnips, parsley, celery, asparagus, turnips, rutabagas, Jerusalem artichokes, pumpkins, horseradish, garlic; greens: basil, coriander (cilantro), green onions, leeks, chives, parsley greens, rhubarb stalks, arugula, lettuce, celery greens, dill, wild garlic, green garlic, spinach, sorrel, tarragon; nuts and seeds: peanuts, cashews, sesame, poppy, macadamia, almonds, Brazil nuts, walnuts, pine nuts, sunflower seeds, pumpkin seeds, pistachios, hazelnuts; vegetable oils: pumpkin oil; yeast; mushrooms: white mushrooms, oyster mushrooms, chanterelles, honey mushrooms, champignons.