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| substances that are produced by living cells that accelerate reactions such as digestion |
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| wave-like contractions that move food down the length of the esophagus in about 5-10 sec. |
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| finger-like projections located on the walls of the small intestines...they increase the amount of surface area which will allow absorption of nutrients to take place faster |
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| is the process by which waste products other than feces are eliminated from the body |
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| disease causing organisms |
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| An iron-containing protein that picks up oxygen in the lungs and transports it to the tissues of the body via red blood cells...gives red blood cells their color |
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| air sacs located at the end of bronchioles that are surrounded by capillaries and are where gas exchange occurs |
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| a small gap between the axon of one and the cell body or dendrite of another neuron |
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| chemicals that are packaged into tiny sacs at the end of each axon that acts as messengers at a synapse |
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| moment upon which the sperm unites with the egg |
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