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QUESTION 23 Which of the following statements is correct, given the following pressure measurements: Aorta = 100 mm Hg Left atrium = 40 mm Hg Left ventricle = 120 mm Hg O The ventricle is in diastole, the filling phase The semilunar valve is open The valves are all closed The atrium is in the ejection phase

QUESTION 23 Which of the following statements is correct, given the following pressure measurements: Aorta = 100 mm Hg Left atrium = 40 mm Hg Left ventricle = 120 mm Hg O The ventricle is in diastole, the filling phase The semilunar valve is open The valves are all closed The atrium is in the ejection phase

Human Anatomy & Physiology (11th Edition)
Human Anatomy & Physiology (11th Edition)
11th Edition
ISBN:9780134580999
Author:Elaine N. Marieb, Katja N. Hoehn
Publisher:Elaine N. Marieb, Katja N. Hoehn
Chapter1: The Human Body: An Orientation
Section: Chapter Questions
Problem 1RQ: The correct sequence of levels forming the structural hierarchy is A. (a) organ, organ system,...
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### Question 23 Which of the following statements is correct, given the following pressure measurements: - **Aorta** = 100 mm Hg - **Left atrium** = 40 mm Hg - **Left ventricle** = 120 mm Hg #### Options: 1. The ventricle is in diastole, the filling phase. 2. The semilunar valve is open. 3. The valves are all closed. 4. The atrium is in the ejection phase. For a detailed understanding, reference to cardiovascular physiology concerning pressure dynamics during the cardiac cycle will aid in answering the question. **Explanation:** - **Option 1:** The ventricle in diastole, the filling phase, is unlikely because the left ventricular pressure (120 mm Hg) is higher than the left atrial pressure (40 mm Hg). - **Option 2:** The semilunar valve (aortic valve) being open is plausible because the left ventricular pressure (120 mm Hg) exceeds the aortic pressure (100 mm Hg), indicating that blood could be ejected into the aorta. - **Option 3:** The probability that all valves are closed is low given the pressure distribution. - **Option 4:** The atrium in the ejection phase is incorrect because atrial ejection would not cause such a high-pressure difference. Therefore, **Option 2: The semilunar valve is open** is correct.
Transcribed Image Text:### Question 23 Which of the following statements is correct, given the following pressure measurements: - **Aorta** = 100 mm Hg - **Left atrium** = 40 mm Hg - **Left ventricle** = 120 mm Hg #### Options: 1. The ventricle is in diastole, the filling phase. 2. The semilunar valve is open. 3. The valves are all closed. 4. The atrium is in the ejection phase. For a detailed understanding, reference to cardiovascular physiology concerning pressure dynamics during the cardiac cycle will aid in answering the question. **Explanation:** - **Option 1:** The ventricle in diastole, the filling phase, is unlikely because the left ventricular pressure (120 mm Hg) is higher than the left atrial pressure (40 mm Hg). - **Option 2:** The semilunar valve (aortic valve) being open is plausible because the left ventricular pressure (120 mm Hg) exceeds the aortic pressure (100 mm Hg), indicating that blood could be ejected into the aorta. - **Option 3:** The probability that all valves are closed is low given the pressure distribution. - **Option 4:** The atrium in the ejection phase is incorrect because atrial ejection would not cause such a high-pressure difference. Therefore, **Option 2: The semilunar valve is open** is correct.
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