Peptide hormones ___________.
are composed of amino acids
always contain one sugar molecule
are lipid soluble
usually bind to intranuclear receptors
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________ are chemical messengers that are released in one tissue and transported in the bloodstream to alter the activities of specific cells in other tissues.
Neuropeptides
Hormones
Neurotransmitters
Humoral antibodies
Antigens
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Endocrine cells
contain few vesicles.
are a type of nerve cell.
release their secretions onto an epithelial surface.
are modified connective-tissue cells.
release their secretions directly into body fluids.
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Compared to the endocrine system, the nervous system is __________.
more rapidly acting
more localized in action
briefer in action
Compared to the endocrine system, the nervous system has all of these characteristics.
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