sperm


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Related to sperm: sperm count, ovulation, Sperm donation, Human sperm

sperm

or

spermatozoon

(spûr'mətəzō`ən, –zō`ŏn), in biology, the male gamete (sex cell), corresponding to the female ovumovum
, in biology, specialized plant or animal sex cell, also called the egg, or egg cell. It is the female sex cell, or female gamete; the male gamete is the sperm. The study of the ovum is included in the science of embryology.
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 in organisms that reproduce sexually. In higher animals the sperm is produced in the testis of the male; it is much smaller than the ovum and consists primarily of a head, whose nucleus bears the hereditary material (see chromosomechromosome
, structural carrier of hereditary characteristics, found in the nucleus of every cell and so named for its readiness to absorb dyes. The term chromosome
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) of the male parent, and a slender whiplike process (flagellum), which provides the motility necessary for fertilizationfertilization,
in biology, process in the reproduction of both plants and animals, involving the union of two unlike sex cells (gametes), the sperm and the ovum, followed by the joining of their nuclei.
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 in a fluid medium. In higher plants the sperm is contained in the pollenpollen,
minute grains, usually yellow in color but occasionally white, brown, red, or purple, borne in the anther sac at the tip of the slender filament of the stamen of a flowering plant or in the male cone of a conifer.
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 grain and is conveyed to the ovum by the pollen tube; in some lower plants (e.g., mosses and ferns) the sperm is actively motile.

Sperm

 

in plants, a nonmotile male sexual cell, or gamete. In higher plants, sperms are nonmotile because they develop inside a pollen tube, which forms upon the germination of a pollen grain (microspore). Fertilization takes place after the pollen tube ruptures upon reaching the female sex organ—the archegonium in gymnosperms or the embryo sac in angiosperms. In gymnosperms a pair of sperms forms as a result of the division of the generative cell. One of the sperms participates in fertilization, and the other dies. Both sperms participate in the fertilization of angiosperms, one fertilizing the ovum, and the other the secondary nucleus of the embryo sac. The male gametes of pteridophytes, bryophytes, and some gymnosperms (including Cycadopsida and ginkgos) are called spermatozoids; they are flagellate and motile.

sperm

[spərm]
(histology)

sperm

1. another name for semen
2. a male reproductive cell; male gamete
References in periodicals archive ?
At SSB, we offer a diverse selection of Open ID Sperm Donors with Industry Leading Extended Genetic Testing, the highest Quality Assurance, and personalized customer service.
Other chemicals, known as PFCs and found in raincoats and non-stick pans, are also linked to poor-quality sperm.
Dr Clair Bennison, the team leader, wrote that the males who produced long sperm were more successful in comparison to ones with shorter sperms as it reached the ova and fertilised it.
Measurement of sperm forward motility: The highly purified form of curcumin (cat.
Lead researcher Prof Matt Gage, from UEA's School of Biological Sciences, said that the salmon-trout system is ideal for studying sperm-egg compatibilities because we are able to conduct controlled fertilization experiments and measure sperm behaviour under conditions to which the gametes are naturally adapted.
13) Before the start of the procedure, the bladder is emptied and buffer solution installed to protect the sperm in the case of retrograde ejaculation.
Taking into account the approximately 70 days it takes for the body to produce a sperm cell, the researchers found that men with normal sperm production had the healthiest sperm in the winter.
We incorporated RPT in a microfluidic device to characterize details of sperm kinematics, including simultaneous measurement of VSL and beat cross frequency.
According to Tina Jensen, lead author of the study from Rigshospitalet in Copenhagen, it cannot be said that it has a causal effect, but other studies have shown that saturated fat intake has shown a connection to other problems and now also for sperm count.
Of the 157 cancer patients referred to the hospital for sperm banking during the 15-month period, 79 questionnaires were returned, with a 50% response rate.
292 g/L and 10% new born calf serum to the pH adjusted MEM before use), washed two times by centrifugation at 600xg for 10 min, and the sperm were then resuspended in the MEM.
She took on the job of sperm bank co-ordinator four years ago.