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About two thirds of it
Usually in the left side of the chest . Very rarely it can be midline , or even on the right of center.
The most important part of the heart is all of it. There all equally as important.
Abduction is the term used to describe the action of moving a body part away from the body's midline. This movement typically occurs in the frontal plane and is the opposite of adduction, which is moving a body part closer to the body's midline.
Origin is typically the proximal attachment of a muscle because it is the least moveable. The distal attachment is where a muscle inserts.
valves
The apex of the heart is the most inferior part of the heart.
Abduction, which is moving a body part away from midline.
Of course - most mass is not visible.
That which is at the heart of something is its essence, the most important and most characteristic part of the thing. It is what makes it what it is.
Most of the mass in the solar system is contained in the Sun. The sun makes up 99.85% of the total mass.
The Consecration, when Our Lord becomes present on the altar is the most sacred part of the Mass.