LEC 4 (14)

LEC 4 (14) - MCB 136 Professor Terry Machen 3/05/09 Lecture...

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MCB 136 Professor Terry Machen 3/05/09 Lecture 14 ASUC Lecture Notes Online is the only authorized note-taking service at UC Berkeley. Do not share, copy or illegally distribute (electronically or otherwise) these notes. Our student-run program depends on your individual subscription for its continued existence. These notes are copyrighted by the University of California and are for your personal use only. D O N O T C O P Y Sharing or copying these notes is illegal and could end note taking for this course. LECTURE The circulatory system is composed of systematic and pulmonary systems. Oxygenated blood in the heart is removed from the left ventricle, from the aortic semi-lunar valve, by the process of systemic circulation . As blood circulates throughout the body, oxygen diffuses from it into cells surrounding the capillaries. The capillaries diffuse carbon dioxide back into the blood, which is then brought back to the heart. This process of diffusion is used for short distances, less than 1 mm. Bulk flow is needed for distances longer than 1mm. To reach the capillaries the blood has to be passed from arteries to arterioles first. Capillaries are the thinnest and most abundant of blood vessels. Venules collect the deoxygenated blood which then goes to veins , the vena cava , and finally to the right atrium of the heart. The pulmonary circulation is opposite of systemic. Deoxygenated blood leaves the systemic system and enters the right atrium of the heart. From there is leaves through pulmonary arteries , goes into the lungs and returns thorough the pulmonary veins to the left atrium of the heart. The systemic circulatory system is highly regulated. The pulmonary circulatory system is, on the other hand, associated with little regulation.
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MCB 136 ASUC Lecture Notes Online: Approved by the UC Board of Regents 3/05/09 D O N O T C O P Y Sharing or copying these notes is illegal and could end note taking for this course. 2 In the equation “P = ρ gh”, “P” is the hydrostatic pressure, “ ρ ” is the liquid density (in kg/m cubed), “g” is gravitational acceleration (in m/sec squared), and “h” is height of the liquid (in m). Different organs in your body require different amounts of blood being circulated to them at all times to function. The amount of blood flow to these areas is controlled by different factors such as temperature. In relation to blood circulation,
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LEC 4 (14) - MCB 136 Professor Terry Machen 3/05/09 Lecture...

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