Erection

Any man knows what an erection is, but only a few are aware of which organ systems are involved in this complex process.
Erection is a natural physiological process of the male body, which involves filling the cavernous bodies of the penis with blood, which leads to enlargement and hardness of the penis.It is natural that only in this state is a man capable of sexual intercourse and conception of offspring.
Erection should be preceded by sexual stimulation by eye contact, touch, smell and hearing.
As a result, the brain gives impulses, which leads to accelerated blood flow, fast and strong filling of the tissues of the penis with blood, and the contraction of muscle fibers makes it difficult to drain blood for some time.