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❤HUMAN Heart❤

A human heart is roughly the size of a large he heart weighs between about 10 to 12 ounces (280 to 340 grams) in men and 8 to 10 ounces (230 to 280 grams) in women.

The heart beats about 100,000 times per day (about 3 billion beats in a lifetime).

An adult heart beats about 60 to 80 times per minute.Newborns' hearts beat faster than adult hearts, about 70 to 190 beats per minute.

The heart pumps about 6 quarts (5.7 liters) of blood throughout the body.

The heart is located in the center of the chest, usually pointing slightly left.

 ❤The human heart is an organ that pumps blood throughout the body via the circulatory system, supplying oxygen and nutrients to the tissues and removing carbon dioxide and other wastes .

❤The tissues of the body need a constant supply of nutrition in order to be active,"

❤The heart is not able to supply blood to the organs and tissues, they'll die."

❤The human heart has four chambers: two upper chambers (the atria) and two lower ones (the ventricles),

❤The right atrium and right ventricle together make up the "right heart," and the left atrium and left ventricle make up the "left heart."

❤A wall of muscle called the septum separates the two sides of the heart

❤A double-walled sac called the pericardium encases the heart, which serves to protect the heart and anchor it inside the chest.

❤Between the outer layer, the parietal pericardium, and the inner layer, the serous pericardium, runs pericardial fluid, which lubricates the heart during contractions and movements of the lungs and diaphragm.

💗The heart's outer wall consists of three layers.

❤The outermost wall layer, or epicardium, is the inner wall of the pericardium.

💕The middle layer, or myocardium, contains the muscle that contracts.

💗The inner layer, or endocardium, is the lining that contacts the blood.

❣The tricuspid valve and the mitral valve make up the atrioventricular (AV) valves, which connect the atria and the ventricles.

💛The pulmonary semi-lunar valve separates the right ventricle from the pulmonary artery, and the aortic valve separates the left ventricle from the aorta.

💙The heartstrings, or chordae tendinae, anchor the valves to heart muscles.

💓The sinoatrial node produces the electrical pulses that drive heart contractions

❤The heart circulates blood through two pathways: the pulmonary circuit and the systemic circuit.

💜In the pulmonary circuit, deoxygenated blood leaves the right ventricle of the heart via the pulmonary artery and travels to the lungs, then returns as oxygenated blood to the left atrium of the heart via the pulmonary vein.

💙In the systemic circuit, oxygenated blood leaves the body via the left ventricle to the aorta, and from there enters the arteries and capillaries where it supplies the body's tissues with oxygen.

💚Drop then a ted blood returns via veins to the venae cavae, re-entering the heart's right atrium.

❤Of course, the heart is also a muscle, so it needs a fresh supply of oxygen and nutrients, too,

💛The cardiovascular system circulates blood from the heart to the lungs and around the body via blood vessels.

After the blood leaves the heart through the aortic valve, two sets of arteries bring oxygenated blood to feed the heart muscle,"

💚The left main coronary artery, on one side of the aorta, branches into the left anterior descending artery and the left circumflex artery.

❤The right coronary artery branches out on the right side of the aorta.

💙Blockage of any of these arteries can cause a heart attack, or damage to the muscle of the heart

A heart attack is distinct from cardiac arrest, which is a sudden loss of heart function that usually occurs as a result of electrical disturbances of the heart rhythm.

💔A heart attack can lead to cardiac arrest, but the latter can also be caused by other problems, he said.

💚The heart contains electrical "pacemaker" cells, which cause it to contract — producing a heartbeat.

❤Each cell has the ability to be the 'band leader' and [to] have everyone follow,

💙In people with an irregular heartbeat, or atrial fibrillation, every cell tries to be the band leader, he said, which causes them to beat out of sync with one another.

❤A healthy heart contraction happens in five stages.

💕In the first stage (early diastole), the heart is relaxed.

💞Then the atrium contracts (atrial systole) to push blood into the ventricle.

💗Next, the ventricles start contracting without changing volume.

💖Then the ventricles continue contracting while empty.

❣Finally, the ventricles stop contracting and relax. Then the cycle repeats.

❤Valves prevent backflow, keeping the blood flowing in one direction through the heart. Heart valves

Four valves within your heart keep your blood moving the right way by opening only one way and only when they need to. To function properly, the valve must be formed properly, must open all the way and must close tightly so there's no leakage. The four valves are:

❤Tricuspid

💛Mitral

💚Pulmonary

💙Aortic

Heartbeats

💝A beating heart contracts and relaxes in a continuous cycle.

💜During contraction (systole), your ventricles contract, forcing blood into the vessels to your lungs and body

💙During relaxation (diastole), the ventricles are filled with blood coming from the upper chambers (left and right atria).

Electrical system

Your heart's electrical wiring keeps it beating, which controls the continuous exchange of oxygen-rich blood with oxygen-poor blood. This exchange keeps you alive.

💓Electrical impulses begin high in the right atrium and travel through specialized pathways to the ventricles, delivering the signal for the heart to pump.

💖The conduction system keeps your heart beating in a coordinated and normal rhythm, which keeps blood circulating.

Various heart disease causes

The causes of heart disease vary by type of heart disease.

Causes of cardiovascular disease

💔While cardiovascular disease can refer to different heart or blood vessel problems, the term is often used to mean damage to your heart or blood vessels by atherosclerosis (ath-ur-o-skluh-ROE-sis), a buildup of fatty plaques in your arteries.

❤Plaque buildup thickens and stiffens artery walls, which can inhibit blood flow through your arteries to your organs and tissues.

💛Atherosclerosis is also the most common cause of cardiovascular disease.

💚It can be caused by correctable problems, such as an unhealthy diet, lack of exercise, being overweight and smoking.

Causes of heart arrhythmia

💙Common causes of abnormal heart rhythms (arrhythmias) or conditions that can lead to arrhythmias include:

💝Heart defects you're born with (congenital heart defects)Coronary artery disease

💘High blood pressure

💖Diabetes

💓Smoking

💗Excessive use of alcohol or caffeine

💞Drug abuse

💕Stress

Some over-the-counter medications, prescription medications, dietary supplements and herbal remedies

💔Valvular heart disease

💚In a healthy person with a normal, healthy heart, no it's unlikely for a fatal arrhythmia to develop without some outside trigger, such as an electrical shock or the use of illegal drugs. That's primarily because a healthy person's heart is free from any abnormal conditions that cause an arrhythmia, such as an area of scarred tissue.

💛However, in a heart that's diseased or deformed, the heart's electrical impulses may not properly start or travel through the heart, making arrhythmias more likely to develop.

Causes of congenital heart defects

❤Congenital heart defects usually develop while a baby is in the womb. Heart defects can develop as the heart develops, about a month after conception, changing the flow of blood in the heart. Some medical conditions, medications and genes may play a role in causing heart defects.

💙Heart defects can also develop in adults. As you age, your heart's structure can change, causing a heart defect.

Causes of cardiomyopathy

🖤The cause of cardiomyopathy, a thickening or enlarging of the heart muscle, may depend on the type:

💚Dilated cardiomyopathy.

The cause of this most common type of cardiomyopathy often is unknown. It may be caused by reduced blood flow to the heart (ischemic heart disease) resulting from damage after a heart attack, infections, toxins and certain drugs. It may also be inherited from a parent. It usually enlarges (dilates) the left ventricle.

💛Hypertrophic cardiomyopathy.

This type, in which the heart muscle becomes abnormally thick, usually is inherited. It can also develop over time because of high blood pressure or aging.

❤Restrictive cardiomyopathy.

This least common type of cardiomyopathy, which causes the heart muscle to become rigid and less elastic, can occur for no known reason. Or it may be caused by diseases, such as connective tissue disorders, excessive iron buildup in your body (hemochromatosis), the buildup of abnormal proteins (amyloidosis) or by some cancer treatments.

Causes of heart infection

A heart infection, such as endocarditis, is caused when an irritant, such as a bacterium, virus or chemical, reaches your heart muscle. The most common causes of heart infection include:

🎾Bacteria

🏀Viruses

🏉Parasites

Causes of valvular heart disease

There are many causes of diseases of your heart valves.

You may be born with valvular disease, or the valves may be damaged by conditions such as:

💓Rheumatic fever

💗Infections (infectious endocarditis)

💘Connective tissue disorders

Risk factors

Risk factors for developing heart disease include:

💕Age:

Aging increases your risk of damaged and narrowed arteries and weakened or thickened heart muscle.

❣Sex: Men are generally at greater risk of heart disease. However, women's risk increases after menopause.

💔Family history.:

A family history of heart disease increases your risk of coronary artery disease, especially if a parent developed it at an early age (before age 55 for a male relative, such as your brother or father, and 65 for a female relative, such as your mother or sister).

💜Smoking:

Nicotine constricts your blood vessels, and carbon monoxide can damage their inner lining, making them more susceptible to atherosclerosis.

Heart attacks are more common in smokers than in nonsmokers.

💙Poor diet:

A diet that's high in fat, salt, sugar and cholesterol can contribute to the development of heart disease.

💚High blood pressure:

Uncontrolled high blood pressure can result in hardening and thickening of your arteries, narrowing the vessels through which blood flows.

💛High blood cholesterol levels:

High levels of cholesterol in your blood can increase the risk of formation of plaques and atherosclerosis.

❤Diabetes:

Diabetes increases your risk of heart disease. Both conditions share similar risk factors, such as obesity and high blood pressure.

💞Obesity:

Excess weight typically worsens other risk factors.

💖Physical inactivity:

Lack of exercise also is associated with many forms of heart disease and some of its other risk factors, as well.

💝Stress.

Unrelieved stress may damage your arteries and worsen other risk factors for heart disease.

🖤Poor hygiene.

Not regularly washing your hands and not establishing other habits that can help prevent viral or bacterial infections can put you at risk of heart infections, especially if you already have an underlying heart condition.

💟Poor dental health also may contribute to heart disease.

Complications

Complications of heart disease include:

💚Heart failure.:

❤One of the most common complications of heart disease, heart failure occurs when your heart can't pump enough blood to meet your body's needs. Heart failure can result from many forms of heart disease, including heart defects, cardiovascular disease, valvular heart disease, heart infections or cardiomyopathy.

💔Heart attack.

A blood clot blocking the blood flow through a blood vessel that feeds the heart causes a heart attack, possibly damaging or destroying a part of the heart muscle.

💜Atherosclerosis can cause a heart attack.

💛Stroke:

The risk factors that lead to cardiovascular disease also can lead to an ischemic stroke, which happens when the arteries to your brain are narrowed or blocked so that too little blood reaches your brain.

A stroke is a medical emergency — brain tissue begins to die within just a few minutes of a stroke.

💚Aneurysm:

A serious complication that can occur anywhere in your body, an aneurysm is a bulge in the wall of your artery. If an aneurysm bursts, you may face life-threatening internal bleeding.

Peripheral artery disease:

💜Atherosclerosis also can lead to peripheral artery disease. When you develop peripheral artery disease, your extremities — usually your legs — don't receive enough blood flow. This causes symptoms, most notably leg pain when walking (claudication).

💙Sudden cardiac arrest:

Sudden cardiac arrest is the sudden, unexpected loss of heart function, breathing and consciousness, often  caused by an arrhythmia. Sudden cardiac arrest is a medical emergency. If not treated immediately, it is fatal, resulting in sudden cardiac death🙏🙏🙏AIMS