The human heart is a fist-sized organ that pumps blood throughout your body. It's the primary organ of your circulatory system. This is a brief discussion about the Parts of the Human Heart.

1. PRESENTED BY: CRISTINE JHIN C. CLARIN 8-RED LAUAN

3. Your heart walls are the muscles that
contract (squeeze) and relax to send blood
throughout your body.
A layer of muscular tissue called the
septum divides your heart walls into the
left and right sides.
The walls of the heart are composed of
three layers: Epicardium - the outer layer.
Myocardium - the middle, muscular layer.
Endocardium - the inner layer.

4. A typical heart has two upper and two lower
chambers. The upper chambers, the right and left
atria, receive incoming blood. The lower chambers,
the more muscular right and left ventricles, pump
blood out of the heart. The heart valves, which keep
blood flowing in the right direction, are gates at the
chamber openings. There are four chambers: the left
atrium and right atrium (upper chambers), and the
left ventricle and right ventricle (lower chambers).
The right side of your heart collects blood on its
return from the rest of your body.

5. Heart valves are parts of your heart that act like
doors. They open and close to let blood flow from
one area of your heart to another. They help
ensure that blood moves at the right time and in
the correct direction. As the valves open and
close, they create two sounds, which are your
heartbeat.
Two of the valves, the mitral and the tricuspid
valves, move blood from the upper chambers of
the heart (the atria) to the lower chambers of the
heart (the ventricles). The other two valves, the
aortic and pulmonary valves, move blood to the
lungs and the rest of the body through the
ventricles.

6. The major blood vessels connected
to your heart are the aorta, the
superior vena cava, the inferior
vena cava, the pulmonary artery
(which takes oxygen-poor blood
from the heart to the lungs where it
is oxygenated), the pulmonary
veins (which bring oxygen-rich
blood from the lungs to the heart),
and the coronary arteries (which
supply blood to the heart muscle).