What is Heart ?

The heart is a muscular organ that pumps blood throughout the body. It's the main organ of the circulatory system
The blood pumped by your heart provides your body with the oxygen and nutrients it needs to function
Function of Heart

Maintains your blood pressure
Your nervous system helps control your heart rate. It sends signals that tell your heart to beat slower during rest and faster during stress.
Controls the rhythm and speed of your heart rate
Your endocrine system sends out hormones. These hormones tell your blood vessels to constrict or relax, which affects your blood pressure. Hormones from your thyroid gland can also tell your heart to beat faster or slower.
Endocardium
Inner layer
Myocardium
Muscular middle layer
Epicardium
Protective outer layer
Right atrium
Two large veins deliver oxygen-poor blood to your right atrium
Right ventricle
The lower right chamber pumps the oxygen-poor blood to your lungs
Left atrium
The pulmonary veins carry the blood to the left atrium
Left ventricle
The left ventricle is slightly larger than the right

Door between your right atrium and right ventricle

Door between your left atrium and left ventricle
Semilunar valves
Semilunar (SL) valves open when blood flows out of your ventricles. They include:
Opens when blood flows out of your left ventricle to your aorta (artery that carries oxygen-rich blood to your body)
Opens when blood flows from your right ventricle to your pulmonary arteries (the only arteries that carry oxygen-poor blood to your lungs)
Blood vessels
Your heart pumps blood through three types of blood vessels

Arteries

Veins

Capillaries
Where our heart located?

Our heart is in the front of our chest. It sits slightly behind and to the left of your sternum (breastbone), which is in the middle of your chest.
Our heart is slightly on the left side of our body. It sits between our right and left lungs. The left lung is slightly smaller to make our left chest. Your rib cage protects our heart.
What does our heart look like?
Our heart looks a little bit like an upside-down pyramid with rounded edges. Large blood vessels go into and out of our heart to bring blood into and away from our heart. They connect our heart to the rest of our body, which it supplies with blood and oxygen.
Symptoms
A heart attack occurs when an artery that supplies blood to the heart is blocked. Symptoms can include:

Coughing

Chest pain

Pain other body

Shortness of breath

Dizziness

Sweating

Feeling sick

Anxiety
Conditions
Heart conditions are among the most common types of disorders. Common conditions that affect your heart include
A heartbeat that’s too fast, too slow or beats with an irregular rhythm.
Unusual thickening, enlargement or stiffening of your heart muscle.
Your heart is too stiff or too weak to properly pump blood throughout your body.
Plaque buildup that leads to narrow coronary arteries.
Your blood sugar is higher than it should be.
A sudden coronary artery blockage that cuts off oxygen to part of your heart muscle.
A valve in your heart isn’t working right.
Your blood is pushing too hard against your artery walls.
Your blood has too many fats in it.
Inflammation in your heart’s lining (pericardium)
Tests Checkup
Tests to check your heart health include:

A test that measures the force of blood flowing through your arteries when your heart beats

A simple, painless test that measures the electrical activity of your heart

Chest X-rays produce images of your heart, lungs, blood vessels, airways, and the bones of the chest and spine

A noninvasive ultrasound scan that uses sound waves to create pictures of the heart

A lab analysis of a small sample of your blood

A test or treatment for certain heart or blood vessel problems, such as clogged arteries or irregular heartbeats

A noninvasive imaging procedure that uses X-rays to create detailed pictures of the inside of the body

A magnetic resonance imaging (MRI) technology used for non-invasive assessment of the function and structure of the cardiovascular system

A heart stress test is a method for evaluating heart function and blood flow. It involves exercising or taking medications that simulate the effects of exercise

A small amount of thallium (radioactive substance) is injected into a vein, and a special camera moves around your heart.