Arrival of an action potential at a presynaptic cell's axon terminals triggers the release of __________, a type of chemical signal.
Fill in the blank(s) with the appropriate word(s).
neurotransmitter
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Which property is true of living things?
a. They are stable over time. b. They are stable over many generations. c. They use protein as their hereditary material. d. They must obtain all organic molecules of life from external sources. e. They consist of one or more cells.
Most digestion occurs and most nutrients and water are absorbed in the __________. Fill in the blank(s) with the appropriate word(s)
Molting in crustaceans is controlled by
a. ecdysone. b. the X organ. c. MIH. d. the Y organ. e. all of these.
Someone who steps on a sharp nail will quickly lift their foot away. This quick reaction is known as a(n)
_____________________. Fill in the blank(s) with the appropriate word(s).