Buy cheap Viagra tablets online – Erection is basically a reflex derived from spinal communication stimulated by visual, imaginary and olfactory stimuli. Once this communication is relayed, it causes contraction and relaxation in the penis. The level and length of erection determines if the penis is functioning normally. A healthy erection is sustained for a longer period of time. It is achieved by a series of nerve stimulation, to nitric oxide secretion, resulting to penile erection and relaxation. Aside from this, testosterone levels and sufficient function of pituitary gland is needed for a normal and healthy erection. Let us check some of the disruptions to this process so we may understand further the actual causes of the different types of erectile dysfunction.
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