d. In the fetus, the ductus arteriousus carries blood from the pulmonary trunk to the aorta
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The fetus receives oxygenated blood form the mother's circulation through the blood vessels of the umbilical cord. It therefore has no necessity for blood to go to the lungs to be oxygenated. Consequently, the blood supply to the fetus is routed around the fluid filled lings. This is done through a temporary blood vessel, the ductus arteriosus, The ductus connects the left pulmonary artery (or pulmonary trunk) and the descending aorta-- by passing the lungs. The ductus arteriosus (or ductus Botalli) usually closes soon after birth. If it remains patent in the bay , the bay is said to have the condition called patent ductus arteriosus (PDA). Some symptoms and signs of PDA may include poor appetite and poor growth of the baby. The affected bay may also develop tachycardia and easy fatigability.