Tutorial - Week 7 Content - Autonomic nervous system Flashcards
An increase in action potential frequency in which of the following classes of neurone will lead to an increase in motility in the small intestine?
a) parasympathetic postganglionic neurones
b) unsympathetic postganglionic neurones
c) sympathetic postganglionic neurones
d) neurones innervating the adrenal medulla
e) sympathetic preganglionic neurones
a
Which of the following classes of drugs could be used to treat hypertension?
a) a drug that stimulates alpha1 receptors
b) a drug that stimulates alpha2 receptors
c) a drug that blocks muscarinic receptors
d) a drug that blocks beta1 receptors
e) a drug that stimulates beta1 receptors
d
Which of the following is NOT involved in the pupillary reflex?
a) parasympathetic postganglionic neurones located in collateral ganglia
b) sensory neurones in the retina
c) synapses in the brainstem
d) preganglionic parasympathetic neurones whose axons course through a cranial nerve
e) constrictor muscles of the iris
a
Which of the following is NOT a feature of sympathetic preganglionic neurones?
a) somata in the spinal cord
b) axon terminals in terminal ganglia
c) small diameter myelinated axons
d) axon terminals in collateral ganglia
e) axons that course through the ventral (anterior) root
b
Which of the following is NOT an action of the parasympathitic division of the autonomic nervous system?
a) Decreased heart rate
b) decreased metabolic rate
c) decreased secretion of digestive enzymes
d) decreased diameter of the pupils
e) decreased tone in the urogenital sphincter
c
Explain what is meant by the terms dual innervation and autonomic tone as these relate to the control of heart rate.
Explain the difference between an adrenergic receptor agonist and antagonist, give an example of each, describe their clinical use and explain the physiological basis of their action
