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Name the 2 different types of valve in the heart
WHICH VENTRICLE IS THICKER ?
What are the 2 main arteries ?
WHAT ARE THE 2 MAIN VEINS?
WHAT CREATES THE 'LUB' SOUND IN A HEART BEAT?
WHAT DOES THE SINO-ATRIAL NODE DO?
why does the electrical impulse in the heart not go straight down from the top of the heart to the bottom?
