[Simulated (OP)]

Just wondring cuzz I hear alot of purring cats

[paul.fr]

These may or may not be related to your question.

Do all cats purr

Panacea...fact or fable

  Why does it give so much pleasure to stroke a cat?

[Simulated (OP)]

Yess that seems to work. Sorry I didn't go look them up first Paul, well I tried and I can't ever get it to work!

[opus]

Stroking a cat has been shown to lower the blood pressure..

[Vcoolspice]

Unlike other cat noises, purring occurs during the entire breathing cycle—inhale and exhale. A meow, on the other hand, is done only during exhalation.

Scientists are still puzzled over the exact mechanism of purring. But the most accepted idea is that a region of the cat’s brain signals the muscles that make up its voice box, called the laryngeal muscles, to vibrate.

Simultaneously,  Mr. Fluffy is inhaling and exhaling, sending a stream of air through the vocal cords. Together these two actions cause the vocal cords to vibrate, creating one feline factor that pleases many humans and makes dog lovers of the rest.