Butte College | 3536 Butte Campus Drive, Oroville CA 95965 | General Information 530-895-2511
The Writers @ Work Annual Writing Competition is a great opportunity for emerging writers to have their work vetted by a talented panel of judges, well-known in their respective fields. Submissions are accepted in fiction, nonfiction, and poetry.
The page you requested could not be found. Try refining your search, or use the navigation above to locate the post.
Although the circulatory system is made up of two cycles, both happen at the same time. The contraction of the heart muscle starts in the two atria, which push the blood into the ventricles. Then the walls of the ventricles squeeze together and force the blood out into the arteries: the aorta to the body and the pulmonary artery to the lungs. Afterwards, the heart muscle relaxes, allowing blood to flow in from the veins and fill the atria again. In healthy people the normal (resting) heart rate is about 72 beats per minute, but it can go much higher during strenuous exercise. Scientists have estimated that it takes about 30 seconds for a given portion of the blood to complete the entire cycle: from lungs to heart to body, back to the heart and out to the lungs.