Start Key Terms: Anatomy & Physiology Autonomic Nervous System

Question: adrenal medulla

Choices:

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

Question: anticholinergic drugs

Choices:

drugs that interrupt or reduce the function of the parasympathetic system

Question: beta (ß)-adrenergic receptor

Choices:

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

Question: baroreceptor

Choices:

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

Question: alpha (a)-adrenergic receptor

Choices:

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

Question: antagonist

Choices:

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

Question: afferent branch

Choices:

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

Question: acetylcholine

Choices:

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

Question: adrenergic

Choices:

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

Question: agonist

Choices:

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

Question: autonomic tone

Choices:

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