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Biology Voc. Words 5.4
Biology
10
Science
9th Grade
03/22/2011

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Term
Enzyme
Definition
substances that are produced by living cells that accelerate reactions such as digestion
Term
Peristalsis
Definition
wave-like contractions that move food down the length of the esophagus in about 5-10 sec.
Term
Villi-
Definition
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
Term
Excretion
Definition
is the process by which waste products other than feces are eliminated from the body
Term
Pathogen
Definition
disease causing organisms
Term
Hemoglobin
Definition
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
Term
Alveoli
Definition
air sacs located at the end of bronchioles that are surrounded by capillaries and are where gas exchange occurs
Term
Synapse
Definition
a small gap between the axon of one and the cell body or dendrite of another neuron
Term
Neurotransmitter
Definition
chemicals that are packaged into tiny sacs at the end of each axon that acts as messengers at a synapse
Term
Fertilization
Definition
moment upon which the sperm unites with the egg
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