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Heart Anatomy
The heart weighs between 7 and 15 ounces (200 to 425 grams) and is a little
larger than the size of your fist
...
5 billion times
...
Your heart is located between your lungs in the middle of your chest, behind and
slightly to the left of your breastbone (sternum)
...
The outer layer of the
pericardium surrounds the roots of your heart's major blood vessels and is
attached by ligaments to your spinal column, diaphragm, and other parts of your
body
...
A
coating of fluid separates the two layers of membrane, letting the heart move as
it beats
...
The upper chambers are called the left and right
atria, and the lower chambers are called the left and right ventricles
...
The left ventricle is the largest and strongest chamber in your heart
...
The pulmonary valve controls blood flow from the right ventricle into the
pulmonary arteries, which carry blood to your lungs to pick up oxygen
...
The aortic valve opens the way for oxygen-rich blood to pass from the left
ventricle into the aorta, your body's largest artery
...
This electrical signal begins in the sinoatrial (SA) node, located at the
top of the right atrium
...
" An electrical impulse from this natural pacemaker travels through
the muscle fibers of the atria and ventricles, causing them to contract
...
The Circulatory System
The heart and circulatory system make up your cardiovascular system
...
Blood delivers oxygen and nutrients to every cell and removes the carbon dioxide
and waste products made by those cells
...
Blood is returned to your heart through venules and veins