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14 Cards in this Set
- Front
- Back
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Matter
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Matter is anything that occupies space and has mass.
Matter exists in one of three states: solid, liquid, or gas. Can be changed physically (ice to water) and chemically (fermenting grapes). |
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Solids
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Solids (eg: bones and teeth) have a definite shape and volume.
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Liquids
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Liquids (eg: blood and interstitial fluid) have a definite volume, but conform to the shape of their container.
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Gases
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Gases (eg: air we breathe) have no shape nor definite volume but still have weight.
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Energy
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Energy has no weight and takes up no space.
Is only measured by its effects on matter (kinetic and potential). |
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Forms of energy
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Kinetic - Energy of motion.
Potential - Stored energy with ability to to used for motion. |
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Chemical energy.
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Stored in the bonds of chemical substances.
Eg: The body processing food of nutrients. |
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Electrical energy
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Results in the movement of charged particles.
Eg: Nervous system uses electrical currents called 'nerve impulses to transmit messages from one part of the body to another. |
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Mechanical energy
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Is energy involved with directly moving matter.
Eg: Riding a bike - muscles in legs shorten, pulling on bones, causing limbs to moves - so you can pedal bike. |
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Radiant energy
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Travels in waves:
- X-ray - Infared (heat energy) - Visible light (eg: stimulates retinas in eyes for sight.) - Ultra Violet (eg: causes sunburn but also stimulates the body to make Vit. D.) - Radiowaves |
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Elements
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An element is a pure substance that cannot be broken down into any simpler substances by ordinary chemical method.
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What are the four elements that make up 96% of human body weight?
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O - Oxygen - 65%
C - Carbon - 18.5% H - Hydrogen - 9.5% N - Nitrogen - 3.2% |
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What are the nine lesser elements that make up the human body?
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Ca - Calcium - 1.5%
P - Phosphorus - 1.0% K - Potassium - 0.4% S - Sulfur - 0.3% Na - Sodium - 0.2% Cl - Chlorine - 0.2% I - Iodine - 0.1% Fe - Iron - 0.1% |
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What are the trace elements found in the human body?
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All less than 0.01%
Cr - Chromium Co - Cobalt Cu - Copper F - Fluorine Mv - Magnesium Mo - Molybdenum V - Vanadium Zn - Zinc |
