


number of sperm increases in ejaculate after puberty but may take some.Serotonin - low leves associated with increased maternal behavior, opposite with infant rejection.Opiods - decreases in these promote social bonding.Ocytocin - secreted by hypothalamus into cerebrum, social bonding, ie maternal behavior.Prolactin - lactation, parental care, alloparental care.can collect bulls off of other bulls as mounts.selection by man may have enhanced this.contraction of smooth and striated muscles.contraction of cauda epididymis, vas deferens.viagra (Sildenafil Citrate) is an inhibitor of the posphodiesterase that breaks down cGMP, therefore increased amounts of cGMP are present leading to maintaining of erection.NO released, guanylate cyclase stimulated, cGMP increases, K channel opens, K ion leave cell, hyperpolarizes cell, ca channels close, muscle relaxes, arteriole dialates, high blood flow.errection - Nitric Oxide (NO) released from parasympathetic nerves and arteriole endothelial cells cause relaxation of artery and arteriole smooth muscle.NE release, NE binding to Na channel, Na ions enter, cell depolarizes, action potential, ca channels open, muscle contracts arteriole constricts, low blood flow.non-erect, helicline arterioles smooth muslce, corpus spongiosum smooth muscle contract via effects of norepinephrine (NE) from sympathetic nerves.Muscle, contraction of ischiocavernosus muscle (parasympathetic) vasodilatation (simtulate parasympathetic), inhibit vasoconstriction (inhibit sympathetic nerves), relax retractor penis.males observing other males or females mounting.volatile substance which elicite specific behavior in the recipient.specific importance varies with species.both male and female sexual behavior is dependent on estradiol receptors.testosterone can be converted to estradiol by aromatase.Its latest release has some great features, such as visual tabs and lots of extensions that can be easily added on.
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plus dihydrotestosterone - decreased sex behavior Opera: The only major browser with a built-in VPN, Opera is a great choice if you want to stay anonymous while browsing the web.plus testosterone - sex behavior restored.no steroids - decreased sexual behavior.plus progesterone and estradiol - maxium estrous behavior.period of time during which copulation will not take place.

