There are several important differences... Due to my home planet's high density, Vulcan skeletal structure is much heavier than humans. Our strength as well measures about three times higher than that of the average human male.
Our blood is copper based instead of iron, and my heart is located here...[Spock points to his side... But he's still looking warily at Walter, wondering if he should walk away before the man decided that cutting into him was a priority.]