Unipolar
. The neuron cannot respond to a second stimulus no matter how strong. Absolute refractory period
What is it called when a neuron Cannot respond to stimulation?
By definition, the refractory period is a period of time during which a cell is incapable of repeating an action potential. … In terms of action potentials, it refers to the amount of time it takes for an excitable membrane to be ready to
respond
to a second
stimulus
once it returns to a resting state.
What neuron Cannot respond to a second stimulus?
The period from the opening of the sodium channels until the sodium channels begin to reset is called the
absolute refractory period
. During this period, the neuron cannot respond to another stimulus, no matter how strong.
When a neuron is not sensitive to another stimulus?
It is called
a RESTING potential
because it occurs when a membrane is not being stimulated or conducting impulses (in other words, it’s resting). What factors contribute to this membrane potential? Two ions are responsible: sodium (Na+) and potassium (K+).
During which of the following phases will a neuron not respond to a second stimulus?
The neuron cannot respond to a second stimulus, no matter how strong. The interior of the cell becomes less negative due to an influx of sodium ions. The specific period during which potassium ions diffuse out of the neuron due to a change in membrane permeability.
Is a period when a membrane Cannot respond to another stimulus no matter how strong?
Relative Refractory period
. The time when there is complete insensitivity of the plasma membrane to another stimulus. Absolute Refractory period. may result from positively charged ions entering the postsynaptic neuron.
During which time period will a neuron not respond to a second stimulus no matter how strong the stimulus may be?
The period from the initiation of the action potential to immediately after the peak is referred to as
the absolute refractory period (ARP)
(see Figs. 1 and 2). This is the time during which another stimulus given to the neuron (no matter how strong) will not lead to a second action potential.
What is difference between depolarization and repolarization?
| DEPOLARIZATION REPOLARIZATION | The firing of an action potential is aided by depolarization. Repolarization stops an action potential from firing. |
|---|
What is a synapse?
Synapse, also called neuronal junction,
the site of transmission of electric nerve impulses between two nerve cells (neurons) or between a neuron and a gland or muscle cell
(effector). A synaptic connection between a neuron and a muscle cell is called a neuromuscular junction. Synapse; Neuron.
What are the 6 steps of action potential?
An action potential has several phases;
hypopolarization, depolarization, overshoot, repolarization and hyperpolarization
. Hypopolarization is the initial increase of the membrane potential to the value of the threshold potential.
Why does a stronger stimulus cause more action potentials?
The trick that the nervous system uses is that
the strength of the stimulus is coded into the frequency of the action potentials that are generated
. Thus, the stronger the stimulus, the higher the frequency at which action potentials are generated (see Figs. 1 and 2 below).
What does the central nervous system use to determine the strength if a stimulus?
The body still needs to determine the strength or intensity of a stimulus. … In order to gauge stimulus intensity, the nervous system relies on
the rate at which a neuron fires and how many neurons fire at any given time
. A neuron firing at a faster rate indicates a stronger intensity stimulus.
Do reflexes produce the same effect every time?
Reflexes are rapid, automatic responses to stimuli that
will produce the same effect every time
. Cell bodies of sensory neurons may be located in ganglia lying outside the central nervous system. During depolarization, the inside of the neuron’s membrane becomes less negative.
Which ion channel is responsible for the rising phase?
In excitable cells such as neurons, myocytes, and certain types of glia,
sodium channels
are responsible for the rising phase of action potentials. These channels go through three different states called resting, active and inactive states.
What is the area where nerve impulse is generated?
The place where an axon terminal meets another cell is called
a synapse
. This is where the transmission of a nerve impulse to another cell occurs. The cell that sends the nerve impulse is called the presynaptic cell, and the cell that receives the nerve impulse is called the postsynaptic cell.
Which ion channel opens in response to a change in membrane potential quizlet?
Sodium gates
in the membrane can open in response to electrical potential changes.
