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A 1992 World Health Organization report described normal human semen as having a volume of 2 mL or greater, pH of 7.2 to 8.0, sperm concentration of 20×10 6 spermatozoa/mL or more, sperm count of 40×10 6 spermatozoa per ejaculate or more, and motility of 50% or more with forward progression (categories a and b) of 25% or more with rapid ...
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Sperm quantity and quality are the main parameters in semen quality, which is a measure of the ability of semen to accomplish fertilization. Thus, in humans, it is a measure of fertility in a man . The genetic quality of sperm, as well as its volume and motility, all typically decrease with age . [ 17 ]
In this video a male (age 35) ejaculates twice (30 minutes between). in the first ejacution the amount of semen is much bigger and the ejacution of semen was easier to achieve. In the second ejaculation the semen releases more slowly.
A human sperm cell consists of a flat, disc shaped head approximately 5.1 by 3.1 μm (0.20 by 0.12 mils), and a tail, known as a flagellum 50 μm (2.0 mils) long. [4] The flagellum propels the sperm cell at about 1 to 3 millimetres per minute (0.66 to 1.97 mils per second). [5]
β-acrosin demonstrates a high degree of sequence identity (70-80%) between boar, bull, rat, guinea pig, mouse, and human isoforms. [3] There exists a somewhat similar (27-35%) sequence identity between β-acrosin and other serine proteases such as trypsin and chymotrypsin. [3]
6406 n/a Ensembl ENSG00000124233 n/a UniProt P04279 n/a RefSeq (mRNA) NM_198139 NM_003007 n/a RefSeq (protein) NP_002998 n/a Location (UCSC) Chr 20: 45.21 – 45.21 Mb n/a PubMed search n/a Wikidata View/Edit Human Semenogelin-1 is a protein that in humans is encoded by the SEMG1 gene. The protein encoded by this gene is the predominant protein in semen. The encoded secreted protein is ...
Hyaluronidase PH-20 is an enzyme that in humans is encoded by the SPAM1 gene. [5] [6] [7] Hyaluronidase degrades hyaluronic acid, a major structural proteoglycan found in extracellular matrices and basement membranes. Six members of the hyaluronidase family are clustered into two tightly linked groups on chromosome 3p21.3 and 7q31.3.