In the male, a countercurrent mechanism between vena and arteria spermatica interna seems well documented. The exchange has been described for heat (Waites, 1970), inert gases (Einer-Jensen, 1974a) and for testosterone (see Setchell, 1973; Einer-Jensen, 1974b).
In the female, much less evidence exists for a similar exchange between the cranial uterine and ovarian blood vessels, although the vessels are close together in many species including sheep, horses, cattle, pigs, rats, rabbits and guineapigs (see Goding & co-authors, 1972). So far, a local exchange has only been described with 133xenon in sheep (Coudert, Phillips, Faiman, Chernecki & Palmer, 1974a) and with prostaglandin F2α in sheep (McCracken, Baird & Goding, 1971; McCracken & co-authors, 1972) and cattle (Hixon & Hansel, 1974).
Using a method similar to the one indicating recirculation of the inert gases, 133xenon and 85krypton, in the male countercurrent system (Einer-Jensen, 1974a), the present experiment was
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