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Prolactin regulates water and electrolyte balance in many organs e. Wiley-Blackwell , International Encyclopedia of Human Sexuality. Other means of sperm competition could include improving the sperm itself or its packaging materials spermatophore. Such characteristics lead to morphological adaptations that suit the purposes of cooperative methods during competition. Ormandy CJ, Camus A, Barra J, Damotte D, Lucas B, Buteau H, Edery M, Brousse N, Babinet C, Binart N, et al. In a mating- guarding system, both parties, male and female, are able to directly and indirectly benefit from this.
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Rheotaxis guides mammalian sperm


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Fluid flow and sperm guidance: a simulation study of hydrodynamic sperm rheotaxis

Since the hyperactivated flagellar waveform is both asymmetric and of larger amplitude [ 18 ], the flagellum receives larger tangential forces, especially in high viscosity solution [ 6 ], which points the sperm into flowing solution. More generally, these observations of virtual sperm emphasize that rheotaxis requires sperm to persist in regions of relatively low shear, so that they are not swept away, and the predictions for the absence of rheotaxis in sperm with highly asymmetric flagellar waveforms is consistent with simply whether the flagellar asymmetry induces an angular velocity that dominates rheotactic-induced turning, or vice versa. However, we found no effects on sperm motility or fertilization and no fertility phenotypes in TRPC5, V1, V3, A1, or M8 knockout mice [ 29 - 33 ].
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