You need your heart for all your body needs. It pumps about 2000
gallons of blood a day. It takes about 20 seconds for blood to reach
every cell in the body. An artery carries blood out from the heart. A
vein carries blood back to the heart. An average adult heart weighs about
10-13 ounces (300 to 350 grams). The rate which the heart pumps varies
depending on what your doing. When at rest the heart pumps more slowly.
When you run the heart rate increases to provide muscles and other tissues
with additional oxygen they need. The typical heart rate is 72 beats per
minute. Each beat gives out 2-3 ounces of blood pumped into the arterial
system. At this heart rate it beats about 104,000 times a day. The
Superior and Inferior are the biggest veins in the body.
The Superior is really the biggest. These veins have a lot of
carbon dioxide and have oxygen-poor blood.
The aorta is the biggest
artery in the whole body. Which will be covered in the report. The
pulmonary vein takes the blood out of the heart and takes it to the
Today we will talk about many different parts of the heart:
The Three Layers of Muscle, Atriums, Ventricles, Systole and Diastole,
Treatments for the Heart, Valves, and many Diseases.
The Three Layers of Muscle
The heart has three layers of a muscular wall. A thin
layer of tissue, the pericardium covers the outside, and another layer,
the endocardium, lines the inside. The myocardium is the middle layer and
is the biggest of all. Myocardial Infarction is a disease later read
about in this report. The pericardium is a fibrous sac which is very
smooth lining. In the space space between the pericardium and epicardium