Study and Learn with 1000s of Biology MCQs
Nerve Impulses MCQs
Nerve impulses pass through a neuron in about _
seven milliseconds
seven microseconds
hundred milliseconds
2 nanoseconds
seven milliseconds
When a neuron is inactive, just waiting for a nerve impulse to come along, the electrical difference across the nerve cell membrane is called its _
energized potential
resting potential
equilibrium potential
None of these
resting potential
In resting potential, the neuron is polarized with __ on the outside of its membrane
Potassium
Iron
nickel
sodium
Sodium
In resting potential, the neuron is polarized with __ on the inside of its membrane
Potassium
Iron
nickel
sodium
Potassium, Sodium
__ is the wave of electrical activity that represents the nerve impulse
action potential
resting potential
equilibrium potential
None of these
action potential
When an impulse travels down an axon covered by a myelin sheath, the impulse must move between the uninsulated gaps that exist between each Schwann cell. These gaps are called?
Loop of henle
nodes of Ranvier
Bowman capsule
None of these
nodes of Ranvier
The _ is when the sodium and potassium ions are returned to their original sides
refractory period
Resting period
Action period
None of these
refractory period
A protein called the _ returns the ions to their rightful sides of the neuron’s cell membrane
Neon-argon pump
Lithium-beryllium pump
Chloride-bromide pump
sodium-potassium pump
sodium-potassium pump
The gap between two neurons is called _
Curvature
cochlea
synapse
None of these
synapse
_ Stimulates or inhibits contraction of muscles, depending on receptor
Norepinephrine
Epinephrine
Dopamine
Acetylcholine
Acetylcholine
_ Affects movement, emotion, and feelings of pleasure, and plays an important role in drug addiction
Norepinephrine
Epinephrine
Dopamine
Acetylcholine
Dopamine
_ is Responsible for fight-or-flight response
Norepinephrine
Epinephrine
Dopamine
Acetylcholine
Epinephrine
_ Increases blood pressure
Norepinephrine
Epinephrine
Dopamine
Acetylcholine
Norepinephrine
_ Regulates sleep, calms anxiety, and affects sexual behavior
Epinephrine
serotonin
Dopamine
Acetylcholine
serotonin
Function of acetylcholine is _
Responsible for fight-or-flight response
Increases blood pressure
Affects movement, emotion, and feelings of pleasure, and plays an important role in drug addiction
Stimulates or inhibits contraction of muscles, depending on receptor
Stimulates or inhibits contraction of muscles, depending on receptor
Function of dopamine is _
Responsible for fight-or-flight response
Increases blood pressure
Affects movement, emotion, and feelings of pleasure, and plays an important role in drug addiction
Stimulates or inhibits contraction of muscles, depending on receptor
Affects movement, emotion, and feelings of pleasure, and plays an important role in drug addiction
Function of norepinephrine is _
Responsible for fight-or-flight response
Increases blood pressure
Affects movement, emotion, and feelings of pleasure, and plays an important role in drug addiction
Stimulates or inhibits contraction of muscles, depending on receptor
Increases blood pressure
Function of epinephrine is _
Responsible for fight-or-flight response
Increases blood pressure
Affects movement, emotion, and feelings of pleasure, and plays an important role in drug addiction
Stimulates or inhibits contraction of muscles, depending on receptor
Responsible for fight-or-flight response
Function of serotonin is _
Regulates sleep, calms anxiety, and affects sexual behavior
Increases blood pressure
Affects movement, emotion, and feelings of pleasure, and plays an important role in drug addiction
Stimulates or inhibits contraction of muscles, depending on receptor
Regulates sleep, calms anxiety, and affects sexual behavior
Source of acetylcholine is __
Secreted at gaps between the neurons and muscle cells
Created from amino acids
Released by postganglionic axons
None of these
Secreted at gaps between the neurons and muscle cells
Source of Dopamine is __
Secreted at gaps between the neurons and muscle cells
Created from amino acids
Released by postganglionic axons
None of these
Created from amino acids
Source of epinephrine is __
Secreted at gaps between the neurons and muscle cells
Created from amino acids
Released by postganglionic axons
None of these
Created from amino acids
Source of Norepinephrine is __
Secreted at gaps between the neurons and muscle cells
Created from amino acids
Released by postganglionic axons
None of these
Released by postganglionic axons
Source of serotonin is __
Secreted at gaps between the neurons and muscle cells
Created from amino acids
Released by postganglionic axons
Produced through enzymatic reaction involving tryptophan
Produced through enzymatic reaction involving tryptophan
