Human chorionic gonadotropin (HCG) is secreted from the placenta.
- During pregnancy, the placenta's syncytiotrophoblastic cells largely generate the hormone human chorionic gonadotropin.
- To keep the pregnancy going, the hormone stimulates the corpus luteum to release progesterone.
- Along with the pituitary, the liver, and the colon, other organs that produce less HCG include the colon.
- The two subunits of HCG are HCG alpha and HCG beta .
- HCG injections are frequently used to promote ovulation in assisted reproductive treatments because they boost progesterone production in the corpus luteum during the early stages of pregnancy.
- It signals the body to stop menstruating and thickens the uterine lining to support a developing embryo.
- After fertilization, HCG levels increase and stay elevated for another 10 weeks or more of pregnancy.
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A describes a gymnosperm.
B describes any type of plant.
C is too vague to even describe a plant.
D (the correct answer) describes an angiosperm (flowering plant). After double fertilization, angiosperms form a fruit over the ovulary of the plant, where the seeds are located.
Light from distant galaxies can help us calculate how old the galaxies are. By analyzing how the how the light has changed by the time it reached us, we can find out how old the star system from which it originates is.
