Biology: The Unity and Diversity of Life
Biology: The Unity and Diversity of Life
15th Edition
ISBN: 9780357093795
Author: STARR
Publisher: CENGAGE LEARNING (CUSTOM)
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Textbook Question
Chapter 36, Problem 2CT

An atrial septal defect is a birth defect in which there is an opening in the septum between the left and right atria. People with such a defect typically have more than a normal amount of blood in the right atrium. Why does blood flow from left to right across the septum rather than in the opposite direction? The excess of blood can cause hypertension in one circuit. Which one?

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How do the walls of the atria compare with the walls of the ventricles and why are they different? Which heart chamber has the thickest muscle wall? Why is it necessary for the chamber in the above question to have a thicker muscle wall? What is the purpose of heart valves? Name & compare the heart valves found between the upper & lower chambers of the right and left sides of the heart ?
Which valve prevents the backflow of blood from the left ventricle into the left atrium? 1.aortic 2.Tricuspid 3.Mitral 4.Pulmonic
when the blood from the heart goes out into the rest of the body it is oxygen rich blood, however when it comes back to the superior vena cava and inferior vena cava would it be oxygenated blood or deoxygenated blood?
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