The ductus arteriosus is a temporary fetal blood vessel that connects the aorta and the pulmonary artery before birth. The ductus arteriosus should be present and open before birth while the fetus is developing in the uterus. Since oxygen and nutrients are received from the placenta and the umbilical cord instead of the lungs, the ductus arteriosus acts as a"short cut" that allows blood to bypass the deflated lungs and go straight out to the body. After birth, when the lungs are needed to add oxygen to the blood, the ductus arteriosus normally closes.
What does PDA mean and what is a PDA?
What does PDA mean? definition, meaning and audio pronunciation (Free English Language Dictionary)
PDAs often include an address book, calendar, contacts list, and a memo feature. Typical PDAs support Internet access and include software you would normally find on an office computer, such as word processing and spreadsheet software. The advent of smartphones and tablets has largely rendered the PDA obsolete, with the average smartphone offering features that go far-and-beyond what the PDA could provide. Although manufacturers have stopped producing PDAs they can still be purchased second-hand or as a refurbished device. The performance of the device depends on the processor speed and the amount of memory RAM. Also, most PDAs support memory cards to allow you to increase the memory capacity of the device. These very useful little devices can also synchronise their data with an application on a PC, for example, on some models the contact list can be synchronised with Microsoft Outlook.
Oxford English and Spanish Dictionary, Thesaurus, and Spanish to English Translator
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Structurally, a typical artery has three tissue layers: the inner layer tunica intima has endothelial tissue; the middle layer tunica media has smooth muscle and elastic connective tissue; and the outer layer tunica externa has connective tissue. See: illustration. These regions include the primary motor and sensory cortices; therefore, a blockage of the internal carotid artery circulation, e. In the neck, the internal carotid artery contains two receptor sites, the carotid body, a chemoreceptor for the oxygen concentration of the blood, and baroreceptors that detect and respond to arterial pressure. Blockages of the vertebral circulation, e.