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31.Efferent neurons a.have cell bodies located only within ganglia b.are part of

Question : 31.Efferent neurons a.have cell bodies located only within ganglia b.are part of : 1417066

 

31.Efferent neurons

a.have cell bodies located only within ganglia

b.are part of a two-neuron chain in the autonomic nervous system

c.arise peripherally at a receptor

d.send information toward the CNS

e.signal only skeletal muscles

32.Select the CNS structure(s) that can influence autonomic activity.

a.medulla

b.hypothalamus

c.spinal cord

d.All of the above

e.Only a and b

33.Botulism is caused by a toxin from bacteria in the species

a.Clostridium

b.Escherichia

c.Salmonella

d.Staphylococcus

e.Streptococcus

34.Which of the following chemicals paralyzes skeletal muscle by binding to the acetylcholine receptor sites?

a.black widow spider venom

b.curare

c.organophosphates

d.insecticide

e.local anesthetics

35.Curare

a.strongly binds to acetylcholine receptor sites

b.inhibits acetylcholinesterase

c.is found in pesticides and military nerve gases

d.has characteristics a and b

e.has characteristics b and c

36.Select the correct statement about the neuromuscular junction.

a.AChE activity is absent here.

b.It involves presynaptic neurons of the autonomic nervous system.

c.It is a junction between two neurons.

d.It is always excitatory.

e.The axon terminals do not store neurotransmitters.

37.Atropine is an antagonist of ACh and works by

a.selectively binding to nicotinic receptors

b.selectively binding to muscarinic receptors

c.blocking the binding of ACh

d.both a and b

e.both b and c

38.Myasthenia gravis

a.is an autoimmune disease

b.occurs when axons are unable to release adequate amounts of acetylcholine

c.can be treated with a drug that temporarily inhibits acetylcholinesterase

d.has characteristics a and c

e.has none of the above characteristics

39.Which of the following is least related to the innervation of skeletal muscle cells?

a.acetylcholine

b.varicosities

c.neuromuscular junction

d.somatic nervous system

e.motor neuron

40.Which effector is not dually innervated?

a.salivary glands

b.urinary bladder

c.pancreas

d.radial muscle of iris

e.bronchioles in lungs

41.Identify the true statement(s):

a.NE causes most blood vessels to constrict.

b.ACh causes the pancreas to release glucagon

c.Binding of a neurotransmitter to a beta-1 receptor on the heart would result in a faster heart rate.

d.Both a and b are true

e.Both a and c are true

42.A drop in blood glucose concentration would likely cause

a.increased release of ACh onto autonomic effectors

b.decreased frequency of impulses along short preganglionic neurons

c.increased frequency of autonomic impulses from the lumbar region of the spinal cord

d.decreased binding of neurotransmitters to alpha-2 receptors in the pancreas

e.all of the above

43.Binding of neurotransmitter to which of the following receptors on an effector would likely cause inhibition of the effector?

a.alpha-1

b.alpha-2

c.beta-1

d.Both a and b

e.Both a and c

44.Activation of ______ receptors usually brings about _______.

a.alpha-1, excitation

b.alpha-2, inhibition

c.beta-1, excitation

d.beta-2, inhibition

e.All of the above are correct choices.

45.Which of the following selectively activates beta-2 receptors at low doses, making it possible to dilate bronchioles in the treatment of asthma?

a.salbuterol

b.atropine

c.metoprolol

d.neostigmine

e.curare

 

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