What is generator potential in physiology?
Medical Definition of generator potential : stationary depolarization of a receptor that occurs in response to a stimulus and is graded according to its intensity and that results in an action potential when the appropriate threshold is reached. — called also receptor potential.
What is the principle of Labelled lines?
Mobeen Syed discusses the labeled line principle. It states that one nerve fiber carries only one sensation, impulse conduction is the same, and the sensory receiver determines the response. Every receptor has one attached nerve. The receptors are of the same kind (for the same sensation).
What is labeled line coding of senses?
The labeled line hypothesis holds that the CNS determines the type of stimulus based receiving input from all sensory cells activated by that stimulus. Lateral inhibition shapes sensory input by refining information between neighboring sensory cells via inhibitory connections.
What generates a receptor potential?
A receptor potential is often produced by sensory transduction. It is generally a depolarizing event resulting from inward current flow. The influx of current will often bring the membrane potential of the sensory receptor towards the threshold for triggering an action potential.
What is a generator potential quizlet?
A generator potential is the depolarization of sensory neurons capable of generating an action potential.
Where do Generator potentials occur?
For the unipolar cells of sensory neurons—both those with free nerve endings and those within encapsulations—graded potentials develop in the dendrites that influence the generation of an action potential in the axon of the same cell. This is called a generator potential.
What is Muller’s law?
ABSTRACT: Johannes Muller’s law of specific nerve energies (LOSNE) states that the. mind has access not to objects in the world but only to our nerves. This law implies that the. contents of the mind have no qualities in common with environmental objects but serve. only as arbitrary signs or markers of those objects.
What is the Labelled lines model?
The labeled-line model predicts that individual taste receptor cells will respond to only a single taste quality. Information about each taste quality is then transmitted by separate afferent pathways to the gustatory cortex via the medulla and the thalamus [25].
Is taste Labelled line?
There is frequently a “best stimulus” for a given neuron, leading to the suggestion that taste exhibits “labeled line coding.” In the extreme, a strict “labeled line” requires neurons and pathways dedicated to single qualities (e.g., sweet, bitter, etc.).
Where are generator potentials produced?
generator potential The local electrical charge that develops in the sensitive part of a receptor cell, known as the generator region. The generator potential is caused by depolarization of the membrane surrounding this part of the cell, brought about by an exchange of ions in response to a stimulus.
Where does generator potential occur?
afferent axon
A graded response to a stimulus, or a graded depolarization induced in the terminal of a sensory receptor, which after achieving a certain level (firing threshold), is capable of producing an action potential in the afferent axon in the nearby sensory neuron.
Is the generator potential the same as the receptor potential?
Some people use the term generator potential synonymously with receptor potential, whereas others prefer to reserve the term receptor potential for those cases where the receptor does not itself generate spikes, as in the receptors of the eye. We will use the term receptor potential here in this latter sense.
When does a stimulus lead to a generator potential?
An adequate stimulus always leads to a receptor or generator potential if it is large enough and applied at the right place. The generator potential normally leads to the formation of action potentials provided it is large enough to bring the membrane potential of the fiber to the critical firing level.
Where does the generator potential of the nerve fiber originate?
This potential, called the generator potential, can be shown to originate in part of the spindle receptor, not in the nerve fiber.
What happens to the generator potential of a tonic receptor?
When a tonic receptor is stimulated, the generator potential it produces is proportional to the intensity of the stimulus. After a threshold depolarization is produced, increases in the amplitude of the generator potential result in increases in the frequency with which action potentials are produced (fig. 10.3).