what gland does the placenta use HCG to communicate with directly?

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Answer 1

The placenta uses human chorionic gonadotropin (HCG) to communicate with the corpus luteum directly. The corpus luteum is a temporary endocrine gland that forms in the ovary after ovulation, it secretes hormones such as estrogen and progesterone, which are essential for maintaining the early stages of pregnancy.

HCG is produced by the placenta and serves as a signal to the corpus luteum to continue producing hormones such as estrogen and progesterone. HCG levels rise rapidly in the first few weeks of pregnancy, peaking at around 8-10 weeks and then gradually declining as the placenta takes over hormone production. HCG also plays a role in detecting pregnancy through home pregnancy tests, which measure the levels of HCG in urine. High levels of HCG are indicative of pregnancy, as the hormone is produced by the placenta only during pregnancy.

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which of the following statements is true concerning calcium ions?multiple choicein smooth muscle, it binds with troponin.in smooth muscle, it binds with myosin light-chain kinase.in skeletal muscle, it binds with calmodulin.in smooth muscle, it binds with calmodulin.in skeletal muscle, it binds with tropomyosin.

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The true statement concerning calcium ions is that in smooth muscle, it binds with calmodulin.

Calmodulin is a calcium-binding protein that is essential for regulating smooth muscle contraction. When calcium ions bind with calmodulin, the complex activates myosin light-chain kinase, which in turn phosphorylates myosin, allowing for actin and myosin to interact and cause muscle contraction. Hence, "in smooth muscle, it binds with calmodulin" is true.

In contrast, in skeletal muscle, calcium ions bind with troponin and tropomyosin to regulate muscle contraction. Understanding the role of calcium ions in muscle contraction is important for treating conditions that affect muscle function, such as muscular dystrophy, and for developing therapies to improve muscle performance.

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