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Which of the following changes does not occur when a fetus is deliveredand begins to breathe on its own for the first time?1. the rate of blood flow throughpulmonary circulation decreases2. the foramen ovale closes3. the ductus arteriosus closes4. the resistance to blood flowthrough the lung decreases
The answer is 1.Because, at the time of birth the bypass of foramen ovale and ductus arteriosus cease to act with the start of breathing, and foramen ovale becomes fossa ovalis, ductus arteriosus becomes ligamentum arteriosum. Also increased oxygen in the lungs causes dectease in blood flow resistance to lungs. Thus option 1 is the answer.Hope it helps. Do give a thubsup👍
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