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the site where a nerve impulse is transmitted from one neuron to the next. There is no physical connection.
a small, circular opening in the exoskeleton of insects that allows air to enter the insect's...
an endocrine gland attached to the base of the hypothalamus, which secretes hormones that play a...
simple chemical substances needed by the body in relatively small amounts for normal growth and...
water-proof, waxy suberin-thickened layer on the radial and transverse cell walls of the...
a foreign substance, usually a protein, that stimulates the production of one or more antibodies...