What is the function of syncytiotrophoblast?
The syncytiotrophoblast, the outermost layer of the human placenta, is the main site of exchange for drugs and metabolites, nutrients, waste products, and gases between the maternal and fetal circulations.
What hormone Does the syncytiotrophoblast produce?
Human chorionic gonadotrophin (hCG)
The syncytiotrophoblast produces both protein and steroid hormones which are released into the maternal blood (M). Human chorionic gonadotrophin (hCG) is aglycoprotein hormone synthesized in the rough ER (arows) of syncytiotrophoblasts immediately after implantation of the blastocyst into the uterine wall.
What is the function of human chorionic gonadotropin hormone?
Human chorionic gonadotropin is a hormone produced primarily by syncytiotrophoblastic cells of the placenta during pregnancy. The hormone stimulates the corpus luteum to produce progesterone to maintain the pregnancy.
Does the placenta perform functions of the kidney?
Functionally, the placenta is a highly complex machine: (1) it acts like a lung in the exchange of oxygen and CO2; (2) it works as a digestive system, absorbing all necessary nutrients for fetal development and growth; (3) it functions as a kidney to remove wastes; and (4) it behaves as an immune barrier that protects …
What does the cytotrophoblast do?
The primary function of an interstitial cytotrophoblast is to anchor the growing fetus to the maternal uterine tissue. These cells may invade the whole endometrium and the proximal third of the myometrium.
What is the difference between cytotrophoblast and syncytiotrophoblast?
The syncytiotrophoblast is a rapidly growing multinucleated mass, which invades and ruptures endometrial capillaries forming lacunae. The cytotrophoblast is a layer of mononucleated cells, which invades the syncytiotrophoblast matrix and forms early chorionic villi.
What is the function of cytotrophoblast?
When is syncytiotrophoblast formed?
Free blastocyst (following the dissolution of the pellucid zone) in adplantation phase on the uterine wall (6th to 7th day). The trophoblast cells of the embryonic pole differentiate themselves, multiply, and form the invasive syncytiotrophoblast.
Is hPL a placental hormone?
Human placental lactogen (hPL), also called human chorionic somatomammotropin (HCS), is a polypeptide placental hormone, the human form of placental lactogen (chorionic somatomammotropin). Its structure and function are similar to those of human growth hormone.
What are the five major functions of the placenta?
Functions of the placenta include gas exchange, metabolic transfer, hormone secretion, and fetal protection. Nutrient and drug transfer across the placenta are by passive diffusion, facilitated diffusion, active transport, and pinocytosis.
