sperm are flagellated; that is, they have a whiplike tail. In higher vertebrates, especially mammals, sperm are produced in thetestes. The sperm unites with (fertilizes) an ovum (egg) of the female to produce a newoffspring. Mature sperm have two distinguishable parts, a head and a tail...
Sperm samples were divided into four equal parts and incubated for 24 h in: HAM's medium alone, in HAM's medium with 1% DMSO and HAM's with 5 microM or 50 microM CoQ10. While no significant change in motility after incubation was observed in the samples with initial normal motility, a...
There are several theories as to what this organ is for and it may well have more than one of these functions:Echolocation - as sperm whales are known to hunt squid in the dark ocean depths, they need some way of finding them. Dolphins are known to use echolocation and the "melon" of...
The morphology of the reproductive system and the mechanics of spermatophore formation in are described. The ductus ejaculatorius simplex of the male was found to consist of two separate functioning parts, divided by a coil area where th... Callahan,S P. - 《Annals of the Entomological Society...
Semen quality and fertility has declined over the last 50 years, corresponding to ever-increasing environmental stressors. However, the cellular mechanisms involved and their impact on sperm functions remain unknown. In a repeated sampling human cohort study, we identify a significant effect of prior...
These bacteria-induced changes can impair semen parameters and subsequently cause infertility. Given the significant destructive effect of some bacteria on sperm function and male fertility, in this study, we reviewed the impact of male urogenital bacteria on spermatogenesis and sperm functions as well ...
The Male Reproductive System: Function & Parts from Chapter 28 / Lesson 2 30K The male reproductive system is designed for sperm production and delivery and is comprised of the testes, epididymis, ductus deferens, three accessory glands, and the penis. Learn how sperm...
To determine whether acrosome function scoring—including acrosomal enzyme (AE) levels and acrosome reaction (AR) results—can predict fertilization rate in vitro. We examined the predictive value of acrosomal enzymes (AE) determined by spectrophotometry
also functions as an extracellular signaling molecule that promotesoocyte maturationand fertilization. Nematode sperm have no flagellum and, instead, extend a lamellipod to crawl over substrates like anamoeba. These cells lack actin, the key motility protein in conventional crawling cells, and base the...
S5). Here we used two complex wavelet functions, the Morlet and the Gaussian. Data analysis in this article was performed using the wavelet toolbox of MATLAB R2017a, in particular the continuous wavelet transform function. The complex Morlet wavelet, cmor1–1.5, was used with scales that ...