seen from Malaysia
seen from Brazil
seen from Sri Lanka
seen from Sri Lanka
seen from Germany
seen from China
seen from United States
seen from United States
seen from France
seen from Germany
seen from Yemen
seen from Germany
seen from Türkiye
seen from Uzbekistan
seen from China
seen from United Kingdom
seen from United States
seen from Türkiye
seen from China
seen from Austria
Biologically speaking, as Michelmore says, "It is logical that the male should be the smaller partner. His only function is to provide spermatozoa; and though the human egg is only just visible to the human eye, the sperm is far, far smaller." The male, in the view of nature, is only a "glorified gonad," in which size is irrelevant.
-Elizabeth Gould Davis, The First Sex
Which cell or cell component is better?
Spermatazoa
Protein kinase
Propaganda!
A spermatozoon (plural: spermatozoa) is a motile sperm cell, or moving form of the haploid cell that is the male gamete. A spermatozoon joins an ovum to form a zygote. (A zygote is a single cell, with a complete set of chromosomes, that normally develops into an embryo.) Sperm cells contribute approximately half of the nuclear genetic information to the diploid offspring.
A protein kinase is a kinase which selectively modifies other proteins by covalently adding phosphates to them (phosphorylation) as opposed to kinases which modify lipids, carbohydrates, or other molecules. Phosphorylation usually results in a functional change of the target protein (substrate) by changing enzyme activity, cellular location, or association with other proteins. The human genome contains about 500 protein kinase genes and they constitute about 2% of all human genes.
Coloured Scanning Electron Micrograph (SEM) of several mature human sperm (also called spermatozoa). Each sperm is about 65 micrometers long and broadly divided into head (red), neck and tail (blue) regions.
MICROGRAPH BY DR TONY BRAIN, SCIENCE PHOTO LIBRARY
Happy Father’s Day to all you Dads out there!
RED07230 by Dave Thomas Via Flickr: Mammalian spermatogenesis
Seminal fluid Analysis in forensics
Seminal fluid Analysis in forensics Seminal fluid is a complex mixture of secretions from at least four male urogenital glands. The seminal vesicle gland contributes approximately 60% to this mixture, the prostate gland contributes approximately...
Seminal fluid is a complex mixture of secretions from at least four male urogenital glands. The seminal vesicle gland contributes approximately 60% to this mixture, the prostate gland contributes approximately 30%, and the combined contribution of the epididymis and bulbourethral glands account for the remaining 10%. Number of Spermatozoa – 50,000 to 3,50,000. Color – Greyish Yellow / Greyish…
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TS of testes!
