Start Key Terms: Anatomy & Physiology Autonomic Nervous System

Question: anticholinergic drugs

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drugs that interrupt or reduce the function of the parasympathetic system

Question: adrenal medulla

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interior portion of the adrenal (or suprarenal) gland that releases epinephrine and norepinephrine into the bloodstream as hormones

Question: adrenergic

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synapse where norepinephrine is released, which binds to a- or ß-adrenergic receptors

Question: baroreceptor

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mechanoreceptor that senses the stretch of blood vessels to indicate changes in blood pressure

Question: agonist

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any exogenous substance that binds to a receptor and produces a similar effect to the endogenous ligand

Question: beta (ß)-adrenergic receptor

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one of the receptors to which epinephrine and norepinephrine bind, which comes in two subtypes: ß1 and ß2

Question: antagonist

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any exogenous substance that binds to a receptor and produces an opposing effect to the endogenous ligand

Question: afferent branch

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component of a reflex arc that represents the input from a sensory neuron, for either a special or general sense

Question: alpha (a)-adrenergic receptor

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one of the receptors to which epinephrine and norepinephrine bind, which comes in three subtypes: a1, a2, and a3

Question: autonomic tone

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tendency of an organ system to be governed by one division of the autonomic nervous system over the other, such as heart rate being lowered by parasympathetic input at rest

Question: acetylcholine

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(ACh) neurotransmitter that binds at a motor end-plate to trigger depolarization