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WorksheetsNerve impulses
Total questions: 21
Worksheet time: 14mins
The inner surface of a cell membrane is usually ____ charged to the outside of the cell
Negatively
Positively
The difference in charges is called
(a)
The difference in charges is caused by an unequal distribution of postive and negative ions inside versus outside the cell
true
false
An impulse, also called an action potential, is
a change in membrane polarization and then return to resting state
the distribution of ions inside the cell
a rapid change in the membrane potential
The action potential progresses from the ____ and down the ____ away from the ___
(a)
once the action potential reaches the axon terminal, a ____ is realsed to send the signal to the next neuron
signal
neurotransmitter
action potential
A resting neuron has a greater concentration of ___ions on the ___ of the cell, and a greater concentration of ___ ions on the ___ of the cell
(a)
The charge of a resting neuron is ___ this is also called its ___. It is polarized(___)
(a)
An action potential is a rapid change in the membrane potential, first in the ___ direction, then in a ___ negative direction, returning to resting potential
positive, negative
negative, positve
nerve cells are specialized to respond to changes in their surroundings
True
False
hyperpolarization means
(a)
hyperpolarization may occur
during depolarization
when the ions switch back to their original positions
when an impulse conduction is interrupted
once the ions have reset, the nueron is considered to be in resting potential until stimulated again
True
False
Action potentials start at the ___ of the neuron and stimulate the ___ channels
dendrites, NA&K
axons, neurotransmitters
synaptic cleft, nodes of ranvier
Impulse conduction is uninterupted along its enitre length (continuous conduction)
Unmyelinated neurons
Mylelinated neurons
"slow conduction"
Unmyelinated neurons
Myelinated neurons
"fast conduction"
Unmyelinated neuron
Myelinated neuron
The "all or none response" states that if a neuron repsonds at all to a stimulation, it responds completely (saltatory conduction)
Unmyelinated neurons
Myelinated neurons
A greater intensity stimulus does not produce a stronger action potential, instead it produces more action potentials per second
True
False
For a very short time follwoing an action potential, a threshold stimulus will not trigger another action potential in that axon, this is called the
(a)
The ___ allows the Na and K ions time to reset to resting potential and ensures that action potentials only occur in a 1-way direction
refractory period
all or none response
saltatory conduction
