Hormone
Organic substance with specific action on the function of certain tissues. They are produced by glands of internal secretion or by certain tissues, and secreted into the blood, which transports them to the effector organs. The main endocrine glands, secretors of hormanas, are the pituitary gland, the adrenal medulla, the thyroid, the pancreas, the ovaries and the testicles. They constitute a system of regulation that, together with nervous regulation, maintain the complex balance in the organism.
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Chemical Glossary Terms
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Chemical Terms begining with H
Hafnium
Chemical element of symbol Hf, belonging to group 4 of the periodic table, of atomic number 72 and a...
Halogens
Family of elements belonging to group VIIA of the periodic table. They form salts with the alkaline ...
Haluros
Binary combinations of a halogen with more electropositive elements. They can be divided into two gr...
Hassio
Chemical element of symbol Hs, belonging to group 8 of the periodic table, of atomic number 108. It ...
Helium
Chemical element of symbol He, belonging to group 18 of the periodic table, of atomic number 2 and a...
Heptane
Alkano of seven carbon atoms, present in the oil and has different chain isomers. It is used togethe...
Heterogeneous.
Term that applies to systems in which there are several phases. A heterogeneous system is not consid...
Hybridization
Combination of atomic orbitals of different types, although of similar energies and with wide possib...
Hydration
Combination of water molecules with ions or polar molecules of the solute in the dissolution process...
Hydrate
Chemical compound that presents water molecules in its structure. The water molecules can be linked ...
Hydrocarbons
Organic compounds that only contain carbon and hydrogen atoms. The main types are alkanes, alkenes, ...
Hydrogenation
Reaction of addition of a hydrogen molecule to a carbon-carbon multiple bond in the presence of meta...
Hydrogen
Chemical element of symbol H, belonging to group 1 of the periodic table, of atomic number 1 and ato...
Hydrolysis
Chemical reaction of a compound with water in which the compound tends to dissociate. In the case of...
Hydroxide (hydro- + oxide).
Alkali or base. Compound that contains one or more hydroxyl groups in its molecule, eg. NaOH and Ca ...
Hydroxyl (hydro- + oxy- + -yl).
Radical monovalent composed of an oxygen atom and a hydrogen atom: OH-. It comes from hydrogen perox...
Hydride
Compound formed by hydrogen and a metal. For example, lithium hydride (LiH). In hydrides, hydrogen h...
Hydrides
Binary combinations of hydrogen with another element. There are three types: saline or ionic hydride...
Iron
Chemical element of Fe symbol, belonging to group 8 of the periodic table, atomic number 26 and atom...
Holmio
Chemical element of symbol Ho, belonging to the series of lanthanides, of atomic number 67 and atomi...
Hormone
Organic substance with specific action on the function of certain tissues. They are produced by glan...
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