pictures and notes are based and from YouTube Atoms VS Molecules Atoms: any element on the periodic table (Ex: oxygen, nitrogen, phosphorus) Molecules: made of multiple atoms Atoms can be the same (water) or different (nitrogen gas) Polar Molecules: molecules with an uneven electron distribution > positive + negative charges Electronegativity (ONE reason why molecules are polar): measures how strongly an atom attracts electrons High Electronegativity: attracts electrons very

Help determine the position of structures by the left and right side of the body Ipsilateral + Contralateral: used when comparing DIFFERENT structures Ipsilateral: different structures that exists on the same side of the body example: the right hand is ipsilateral to the right thigh Contralateral: different structures that exists on opposite sides of the body example: the left arm is contralateral to the right foot Unilateral + Bilateral: used when describing ONE structure Un