Search results
Results from the WOW.Com Content Network
The ductus arteriosus, also called the ductus Botalli, named after the Italian physiologist Leonardo Botallo, is a blood vessel in the developing fetus connecting the trunk of the pulmonary artery to the proximal descending aorta. It allows most of the blood from the right ventricle to bypass the fetus's fluid-filled non-functioning lungs.
In the fetus, there is a special connection between the pulmonary artery and the aorta, called the ductus arteriosus. [2] Because the aorta has lower pressure than the pulmonary artery, most of the blood flows across the ductus arteriosus away from the lungs. [1]
During fetal development, the ductus arteriosus is kept open by high levels of a vasodilator prostaglandin E2 which is made by the placenta and by the ductus arteriosus itself. At birth a bunch of things change, though—oxygen levels in the blood go up dramatically and the lungs become the main source of oxygenated blood.
Oxygen concentration causes the production of bradykinin which causes the ductus to constrict occluding all flow. Within 1–3 months, the ductus is obliterated and becomes the ligamentum arteriosum. The ductus arteriosus connects at a junction point that has a low pressure zone (commonly called Bernoulli's principle ) created by the inferior ...
This embryonic process is necessary for the future stability of the mature vascular network. [2] Vasculogenesis is the initial establishment of the components of the blood vessel network, or vascular tree. This is dictated by genetic factors and has no inherent function other than to lay down the preliminary outline of the circulatory system.
ABC News and star anchor George Stephanopoulos have agreed to pay President-elect Trump $16 million to settle a defamation lawsuit. The settlement was publicly filed Saturday, just days before the ...
A man who raped a vulnerable woman after posing as a good samaritan and luring her to his Aberdeen flat has been jailed for five years. Diego Valdivieso, 30, offered the young woman a bed at his ...
Functional closure of the ductus arteriosus occurs within the first 24 hours, with permanent closure following within 4 weeks. Lastly cardiac output increases to nearly double what it was in utero. All of these cardiovascular system changes result in the adaptation from fetal circulation patterns to an adult circulation pattern.