Answer:
FSH and LH are released from the anterior pituitary gland
Explanation:
The anterior pituitary secretes the trophic hormones. Two of them are the gonadotrophic hormones, that affect the gonads (testes and ovaries). These hormones are the follicle-stimulating hormone (FSH) and the luteinizing hormone (LH). In females, these hormones help the ovocytes and the follicles to maturate. At the beginning of the female cycle, high concentrations of these hormones stimulate the ovary follicle, which grows and secretes estrogens. Under the influence of these last ones, the endometrium gets regenerated. When concentrations of estrogens get high (before the middle of the cycle), it occurs a pic in LH secretions from the hypophysis (pituitary gland), which produce the ovocyte expulsion: <em>ovulation</em>. After that, LH and FSH concentrations fall.
Jet streams are found in the upper troposphere
Answer:
hina
Explanation:
double bond in chemistry is a covalent bond between two atoms involving four bonding electrons as opposed to two in a single bond. Double bonds occur most commonly between two carbon atoms, for example in alkenes. Many double bonds exist between two different elements: for example, in a carbonyl group between a carbon atom and an oxygen atom. Other common double bonds are found in azo compounds (N=N), imines (C=N) and sulfoxides (S=O). In a skeletal formula, a double bond is drawn as two parallel lines (=) between the two connected atoms; typographically, the equals sign is used for this.[1][2] Double bonds were first introduced in chemical notation by Russian chemist Alexander Butlerov.[citation needed]
Double bonds involving carbon are stronger than single bonds and are also shorter. The bond order is two. Double bonds are also electron-rich, which makes them potentially more reactive in the presence of a strong electron acceptor (as in addition reactions of the halogens).