A closer look
Those dramatic, completely unrealistic blood splatters in cheap slasher movies are actually backed up by some solid cardiology. Your heart is an incredibly powerful muscular pump that needs to force thick, syrupy blood through miles of resistant vessels. To fight gravity and reach your brain, the left ventricle squeezes with immense force. If you were to accidentally sever a major artery like the aorta or femoral, that pressurized system vents instantly, turning you into a biological water gun capable of hitting the far wall of your living room.
