No abstract available
MeSH terms
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Action Potentials
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Animals
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Guinea Pigs
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Heart / drug effects*
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Heart Ventricles / drug effects
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Male
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Membrane Potentials
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Microelectrodes
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Papillary Muscles / drug effects
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Propranolol / pharmacology
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Thyroid Hormones / pharmacology*
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Thyroxine / pharmacology
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Triiodothyronine / pharmacology
Substances
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Thyroid Hormones
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Triiodothyronine
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Propranolol
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Thyroxine