​•The human body is mostly water

–Lean muscle: 75% water

–Blood: 83% water

–Body fat: 25% water

–Bone: 22% water

Water​

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​•Water is a polar molecule

– Each atom has a partial charge

–Molecule has zero net charge

​Properties of Water

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​Molecules of LIfe

​Special Properties of Water

•Polar molecules have special properties

–Good solvents

–Bond with each other (cohesion)

–Take longer to heat and cool

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•Water molecules are attracted to molecules of solid surfaces (adhesion)

•Adhesion allows water to move through very small pores or tubes against gravity (capillary action)

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​Learning Check-up

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​Macromolecules

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​Main source of energy in our body.

​​Carbohydrates

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​Stores energy and make up biological membranes and waterproof coverings.

​​Lipids

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​Stores and transmit genetic information

​​Nucleic acid

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​Control rate of chemical reactions through enzymes. Makes up bones and muscles.

​Protein

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Learning Check-up​

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