oxygen and nutrients pass through the placenta from mother to embryo.
oxygen and nutrients pass through the placenta from mother to embryo.
what passes through the placenta from mother to embryo?
oxygen and nutrients
the fetus and embryo develop within the uterus, an organ that sits within the pelvis of the mother. the process the mother experiences whilst carrying the fetus or embryo is referred to as pregnancy. the placenta connects the developing fetus to the uterine wall to allow nutrient uptake, thermo-regulation, waste elimination, and gas exchange via the mother's blood supply; to fight against internal infection; and to produce hormones which support pregnancy. the placenta provides oxygen and nutrients to growing fetuses and removes waste products from the fetus's blood. the placenta attaches to the wall of the uterus, and the fetus's umbilical cord develops from the placenta. these organs connect the mother and the fetus. placentas are a defining characteristic of placental mammals, but are also found in marsupials and some non-mammals with varying levels of development. the homology of such structures in various viviparous organisms is debatable, and in invertebrates such as arthropoda, is analogous at best.
development of the human body
after implantation, facehuggers die and the embryo's host wakes up afterward, showing no considerable outward negative symptoms and a degree of amnesia regarding events at the time of implantation. symptoms build acutely after detachment of the facehugger, the most common being sore throat, slight nausea, increased congestion, and moderate to extreme hunger. in later stages where the incubation period is extended in preparation of a queen birth, symptoms will include a shortness of breath, exhaustion, and hemorrhaging (detectable through biological scanners and present in nosebleeds or other seemingly random bleeding incidents), as well as chest pains inflicted, either in lack of chest space due to the chestburster's presence or even premature attempts to escape the host. the incubating embryo takes on some of the host's dna or traits, such as bipedalism, quadrupedalism, possessing the mandibles of a predator, and other structural changes. according to weyland-yutani medical scientists in "aliens: colonial marines", the chestburster will draw nutrients from the host's body in order to develop a placenta as it grows, attaching itself to several major organs in the process. the placenta has cancerous qualities, such that even if the embryo were removed surgically, the placenta would simply cause the affected organs to shut down, resulting in death: "the embryo will extract fluid and nutrients from the host to construct a placenta, but it-it's not like a human's; the placenta is like a weed, rooting itself into every organ in the chest cavity. look, even "if" you can surgically remove the embryo, the placenta, it's... it's like a cancer; your organs will begin shutting-down, one-by-one, and then... you just... you just die."
alien (creature in alien franchise)