This is my extra post to make up for one that was previously missed. I want to focus this post on the circulatory system. We have learned that there are many different functions of the circulatory system. Some of them include: brings blood containing nutrients, oxygen, and hormones to cells, transport wastes away from cells, fights infections, regulated body temperature, and helps stabilize pH concentration of bodily fluids. The circulatory system is made up of the heart, blood, arteries, veins, and capillaries.
The heart is a muscular pump which moves blood throughout the body and sits in a pericardial sac. There are three layers of the heart: the pericardium, myocardium, and endocardium. The pericardium surrounds the perimeter of the heard and is a protective sac of connective tissue. The myocardium is the muscle of the heart which is made up of contracting cardiac muscle fibers. The endocardium is the inner surface of the myocardium. The heart has four chambers: two atria and two ventricles. The atria are the two upper chambers and then receive blood from veins and send blood to the ventricles. The ventricles are the two lower chambers and they receive blood from the artia and pump blood out through the arteries.
Since the flow of blood through the heart is an important process to understand, I found a video that helps explain each step of the process. The link is: http://www.youtube.com/watch?v=Rj_qD0SEGGk
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