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15 Cards in this Set

  • Front
  • Back
What are the two main branches of the ANS?
1) Afferent (sensory) branch

2) Efferent (motor) branch
Which branch of the ANS is further divided into the sympathetic and the parasympathetic branches?
The efferent/motor branch
Which functions and tissues are under the control of the motor branch of the ANS?
1) Involuntary motor function - smooth muscle, cardiac muscle

2) Release of chemicals from glands
Which neurotransmitters are used at cholinergic synapses?
Acetylcholine (ACh) and only acetylcholine.
What are the difference between pre-ganglionic and post-ganglionic neuronal axons in the ANS?
Pre-ganglionic axons are small-diameter, myelinated B fibers. Post-ganglionic axons are even smaller-diameter unmyelinated C fibers.
Name the neurotransmitter released by all cholinergic neurons:
All cholinergic neurons by definition release acetylcholine (ACh) and only acetylcholine
Do "sympathetic" and "adrenergic" mean the same thing?

What about "parasympathetic" and "cholinergic"?

Why or why not?
The answer is no!

Adrenergic/cholinergic refers only to the kind of neurotransmitter released by a neuron. If a neuron releases noradrenaline, it is adrenergic. If a neuron releases acetylcholine, it is cholinergic, even if it is part of a sympathetic pathway.

All pre-ganglionic neurons in the ANS, including sympathetic pre-ganglionic neurons, are cholinergic because they release acetylcholine.
Which neurotransmitter do sympathetic pre-ganglionic neurons release?
Name the neurotransmitter released by adrenergic neurons:
All adrenergic neurons release noradrenaline by definition.

What about adrenaline?
Which receptor type is found on all post-ganglionic neurons?
Nicotinic cholinergic (because all pre-ganglionic neurons release acetylcholine)
Which receptor type is found on the effectors innervated by post-ganglionic parasympathetic neurons?
Muscarinic cholinergic receptors
Which autonomic receptor type is found on airway smooth muscle?
Beta-2 adrenergic receptors
Which autonomic receptor type is found on coronary vessel smooth muscle?
Beta-2 adrenergic receptors
Which autonomic receptor type is found on blood vessel smooth muscle cells?
Alpha-1 adrenergic receptors
Which neurotransmitter is released by post-ganglionic parasympathetic neurons?