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21.Acetylcholinesterase a.has enhanced activity from organophosphates b.inactivates a neurotransmitter. c.is a neurotransmitter d.stimulates an

Question : 21.Acetylcholinesterase a.has enhanced activity from organophosphates b.inactivates a neurotransmitter. c.is a neurotransmitter d.stimulates an : 1417065

 

21.Acetylcholinesterase

a.has enhanced activity from organophosphates

b.inactivates a neurotransmitter.

c.is a neurotransmitter

d.stimulates an EPSP

e.triggers the release of sodium from postsynaptic cells

22.Which organ is not innervated by the parasympathetic division?

a.blood vessels

b.intestines

c.eye

d.liver

e.erectile tissues

23.The neuromuscular junction

a.is the junction between a motor neuron and a skeletal muscle fiber

b.transmits an action potential between the nerve cell and muscle cell on a one-to-one basis

c.may produce either an EPSP or an IPSP on the motor end plate

d.has all of the above characteristics

e.has characteristics a and b

24.Acetylcholine

a.opens voltage-gated Na+ channels in skeletal muscle fibers, which causes depolarization of the muscle fibers

b.may decrease the permeability of the motor end plate to Na+ and K+ when combined with the receptor sites on the motor end plate

c.always depolarizes skeletal muscle fibers and postganglionic neurons

d.does both a and b

e.does both b and c

25.Which type of receptor binds norepinephrine on cardiac muscle, thus increasing cardiac activity?

a.cholinergic

b.nicotinic

c.alpha

d.beta-1

e.beta-2

26.Acetylcholine

a.binds to cholinergic receptors on preganglionic neurons and skeletal muscle cells

b.destroys acetylcholinesterase

c.binds to muscarinic receptors

d.is released from all postganglionic neurons

e.does all of the above except b

27.Which of the following events occurs after all the other steps listed when describing the stimulation of a skeletal muscle fiber?

a.ACh binds with receptors on the muscle cell membrane, opening sodium channels.

b.ACh diffuses across the cleft of the junction.

c.ACh is released by exocytosis.

d.Calcium diffuses into the terminal button.

e.Voltage-gated channels for calcium in the axon terminal are opened.

28.What is the fate of ACh following binding to receptors?

a.It remains bound, causing continued excitement.

b.It is removed by acetylcholinesterase.

c.It is actively reabsorbed by the axon terminal.

d.It is passively reabsorbed by the muscle cell.

e.None of the above.

29.What would occur if ACh was not removed from the nicotinic receptors on skeletal muscle cells?

a.The cell would relax.

b.The cell would repolarize with the opening of chloride channels.

c.The cell would remain contracted until fatigued.

d.Sodium would continue to move into the cell, causing excitation.

e.Both c and d would occur.

30.An EPP

a.occurs because of Na+ diffusing into a muscle fiber after ACh binds with a receptor on the muscle fiber

b.is usually smaller in magnitude than an EPSP

c.is terminated when Ca2+ inactivates acetylcholine

d.has characteristics a and b

e.has characteristics a and c

 

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