At its very essence, an erection is a hydraulic event. Blood is pumped into the penis, causing it to swell and become firm and erect. As one might expect however, this action requires an amazing orchestration of body mechanisms to achieve. During the flaccid (non-erect,Cheapest Uk Supplier Viagra) state, the cavernous arteries leading to the cavernous sinuses contract, reducing the inflow of blood. The smooth muscles regulating the many tiny blood vessels within the penis also contract e.g., epinephrine, acetylcholine, nitric oxide) that relax the smooth muscles in the penis, allowing blood to flow into the tiny sinuses, or caverns, and flood the penis. These signals travel from the brain to the lower part of the spinal cord, sending signals to the corpus cavernosa nerves (Cheapest Uk,also known as cavernous nerves), which direct the cavernous arteries to let blood into the penis causing an erection. The amount of blood in the penis increases six-fold during an erection. The spongy chambers nearly double in diameter due to the increase in blood flow, increasing penile girth, width, and hardness. As the veins surrounding the corpa cavernosum and corpus spongiosum are closed by the pressure of the erectile tissue, they are unable to drain blood out of the penis, causing it to remain rigid. As men are well aware, direct genital stimulation can also produce an erection, but involve different nerve pathways. In this case, the sensory input is carried by the pudendal nerve, which runs from the penis to nerves in the lower spine. These nerves send messages that cause the arteries in the penis to admit blood. Obviously, an erection is temporary in duration. Additional sensory input — usually an orgasm, but possibly a distraction, interruption, disinterest, or even cold temperature — brings an erection to an end. This occurs when the chemical messengers that started and maintained the erection stop being produced and other chemicals destroy the remaining messengers. Blood seeps out of the caverns of the corpora cavernosa, allowing the veins in the penis to reopen and drain blood from the penis. The Prostate The main function of the prostate is to produce a special milky fluid that is combined with the sperm during ejaculation. The sperm is made in the testicles and is delivered to the urethra during orgasm. Prostatic fluid contains a number of substances, including minerals, proteins, enzymes and a substance called prostatic specific antigen (PSA,Supplier Viagra). These substances help the movement of the sperm through the urethra and the unfriendly environment of the vagina. They also nourish the sperm and keep it liquid by preventing it from becoming too sticky. PSA is especially useful in this regard. The prostate is made up of about 30% muscular tissue; the rest is glandular tissue.
The Sexual Response Cycle
The sexual response cycle is a specific sequence of physical and emotional changes that occur as a person becomes sexually aroused and engages in sexually stimulating activities, including sexual intercourse and masturbation. Phases The sexual response cycle consists of four distinct phases: arousal; plateau; orgasm; and resolution . These phases are experienced by both men and women, although the timing usually varies between individuals, e.g., it is unlikely that both partners will reach orgasm at the same time. Also, the intensity of the response to stimulation and the time spent in each phase will vary from person to person. Phase 1: Arousal This phase starts with some kind of sexual stimulation - a touch, a sight, or a thought. Blood begins to move to various parts of the body. This phase can last from a few minutes to several hours, and includes the following general characteristics: Increased muscle tension Accelerated breathing and heart rate Blood flow is increased, resulting in possible flushed skin (Cheapest Uk Supplier Viagra,red blotches may appear on the chest and back). The lips, nipples (sometimes nipples become erect), earlobes and genitals become fuller and more sensitive. The penis begins to fill with blood and become erect, and the scrotum starts to thicken, pulling the testicles closer to the man’s body. Swelling starts in the woman’s clitoris and labia minora (commonly referred to ‘lips’, the area around the vaginal opening,Uk Supplier Viagra). Vaginal lubrication begins in anticipation of sexual penetration. The woman’s breasts become fuller and her vaginal walls begin to swell. Phase 2: Plateau Continued stimulation results in a firming penis, possibly darkening in color.