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The electrical impulse moves through the heart as it contracts between 60 to 140 times a minute, depending on age of person. The contractions of ventricles represents a single heartbeat. Atria contraction is a little faster then the ventricles so the blood empties into the ventricle before their contraction.

Maxwell Quick Medical Reference, ISBN 978-0-9645191-4-5

after my microbiology class.

Akc Mini/toy Parti Poodle Puppies

Ha!!! Run like theres a hot guy in front of you and a creepy dude behind you

Sad but So true.....