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Acne (/ ˈ æ k n i / ⓘ AK-nee), also known as acne vulgaris, is a long-term skin condition that occurs when dead skin cells and oil from the skin clog hair follicles. [10] Typical features of the condition include blackheads or whiteheads, pimples, oily skin, and possible scarring.
Alpha cells are endocrine cells, meaning they secrete a hormone, in this case glucagon. Alpha cells store this glucagon in secretory vesicles that typically have an electron dense core and a grayish outer edge. [1] It is believed that alpha cells make up approximately 20% of endocrine cells within the pancreas. [1]
A hormone (from the Greek participle ὁρμῶν, "setting in motion") is a class of signaling molecules in multicellular organisms that are sent to distant organs or tissues by complex biological processes to regulate physiology and behavior. [1] Hormones are required for the correct development of animals, plants and fungi. Due to the broad ...
The anterior portion of the pituitary gland produces luteinizing hormone (LH) and follicle-stimulating hormone (FSH), and the gonads produce estrogen and testosterone. In oviparous organisms (e.g. fish, reptiles, amphibians, birds), the HPG axis is commonly referred to as the hypothalamus-pituitary-gonadal-liver axis (HPGL-axis) in females.
Ovulation occurs 24–48 hours after the luteinizing hormone peak, which occurs around the fourth day of estrus; therefore, this is the best time to begin breeding. Proestrus bleeding in dogs is common and is believed to be caused by diapedesis of red blood cells from the blood vessels due to the increase of the estradiol-17β hormone. [20]
"Eicosanoid" (from Greek eicosa- ' twenty ') is the collective term [8] for straight-chain PUFAs (polyunsaturated fatty acids) of 20 carbon units in length that have been metabolized or otherwise converted to oxygen-containing products.
An example of a phosphatidylcholine, a type of phospholipid in lecithin. Shown in red – choline residue and phosphate group; black – glycerol residue; green – monounsaturated fatty acid residue; blue – saturated fatty acid residue.
Testosterone is one of the hormones controlling libido in human beings. Emerging research [53] is showing that hormonal contraception methods like oral contraceptive pills (which rely on estrogen and progesterone together) are causing low libido in females by elevating levels of sex hormone-binding globulin (SHBG). SHBG binds to sex hormones ...