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Advanced Patho EXAM 2

Quiz yourself by thinking what should be in each of the black spaces below before clicking on it to display the answer.
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Question
Answer
The heart starts beating and blood circulates on what day?   21st day or by the end of the 3rd week  
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What is the first organ system to reach a functional state?   cardiovascular system  
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When can the embryonic heartbeat be detected by doppler ultrasound?   5th week  
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True or false, after birth, the foramen ovales are no longer needed so they close.   True  
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During fetal growth, why is the ductus arteriosus important?   so that oxygenated blood is provided  
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What happens to the ductus arteriosus at birth?   It should close  
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What role does prostaglandin play in PDA?   can cause constriction of the PDA in premature infants  
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During pregnancy, when does the laryngotracheal diverticulum develop?   by the end of 4th week  
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When does surfactant production begin?   20-22 weeks  
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True of false, infants born before 24 weeks have sufficient surfactant to survive.   False, they do not have sufficient surfactant to survive without medical aid.  
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