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in th 1) Which of the events below occurs when the semilunar valves are A) Ventricles are in diastole. B) Blood leaves pulmonary arteries and the aorta. CAV valves are closed. D) Both A & B E.) None of the above

in th 1) Which of the events below occurs when the semilunar valves are A) Ventricles are in diastole. B) Blood leaves pulmonary arteries and the aorta. CAV valves are closed. D) Both A & B E.) None of the above

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:** 1) Which of the events below occurs when the semilunar valves are open? A) Ventricles are in diastole B) Blood leaves pulmonary arteries and the aorta C) AV valves are closed D) Both A & B E) None of the above **Answer:** The correct option is **B) Blood leaves pulmonary arteries and the aorta**, and **C) AV valves are closed** is also circled, indicating it could be another correct response depending on the context provided by the source material. Option D (**Both A & B**) and option E (**None of the above**) can be evaluated based on the specific system functions being studied. **Explanation:** Semilunar valves are open during ventricular systole, allowing blood to be ejected from the heart into the pulmonary artery and the aorta, supporting the selection of options B and C. AV valves being closed at this time prevents backflow into the atria.
Transcribed Image Text:**Question:** 1) Which of the events below occurs when the semilunar valves are open? A) Ventricles are in diastole B) Blood leaves pulmonary arteries and the aorta C) AV valves are closed D) Both A & B E) None of the above **Answer:** The correct option is **B) Blood leaves pulmonary arteries and the aorta**, and **C) AV valves are closed** is also circled, indicating it could be another correct response depending on the context provided by the source material. Option D (**Both A & B**) and option E (**None of the above**) can be evaluated based on the specific system functions being studied. **Explanation:** Semilunar valves are open during ventricular systole, allowing blood to be ejected from the heart into the pulmonary artery and the aorta, supporting the selection of options B and C. AV valves being closed at this time prevents backflow into the atria.
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Semilunar valves are named so because of the crescent moon shape of the flaps that make up the valve. There are two sets of semilunar valves present in the heart. 

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