What statement describes a receptor potential?
A receptor potential is a graded response to a stimulus that may be DEPOLARIZING or HYPERPOLARIZING. Receptor potentials have a threshold in stimulus amplitude that must be reached before a response is generated, and their amplitude saturates in response to intense stimuli.
How is a receptor potential generated?
cellular mechanisms in chemoreception. The initial changes are called receptor potentials, and they are produced by the movement of positively charged ions (e.g., sodium ions) into the cell through openings in the cell membrane called ion channels.
Which of the following occurs first in the generation of an action potential quizlet?
Which of the following occurs first in the generation of an action potential? Voltage-gated sodium channels open. Voltage-gated potassium channels open.
Which of the following occurs during depolarization?
During depolarization, the membrane potential rapidly shifts from negative to positive. … As the sodium ions rush back into the cell, they add positive charge to the cell interior, and change the membrane potential from negative to positive.
How does a receptor potential cause an action potential?
A receptor potential is often produced by sensory transduction. It is generally a depolarizing event resulting from inward current flow. … Within the same neuron, a receptor potential can cause local current to flow to a region capable of generating an action potential by opening voltage gated ion channels.
Where does receptor potential occur?
For example, receptor potentials occur in the rods and cones of the eye, but the first spikes in the visual system occur in the ganglion cells.
Where do most action potentials originate?
Action potentials can originate not only at the axon hillock, but also in the axon initial segment, 30–40 μm from the soma and close to the first myelinated segment. In some neurons the action potential even originates at the first node of Ranvier, where sodium channels are highly concentrated (Figure 1).
What happens during action potential?
An action potential occurs when a neuron sends information down an axon, away from the cell body. … The action potential is an explosion of electrical activity that is created by a depolarizing current. This means that some event (a stimulus) causes the resting potential to move toward 0 mV.
Does hyperpolarization cause action potential?
Hyperpolarization is a change in a cell’s membrane potential that makes it more negative. It is the opposite of a depolarization. It inhibits action potentials by increasing the stimulus required to move the membrane potential to the action potential threshold.
Which statement is true regarding the action potential process?
The correct answer is c. An action potential, once started, cannot be stopped or negated.
What causes an action potential quizlet?
An action potential occurs when a neuron sends information down an axon, away from the cell body. The action potential is an explosion of electrical activity that is created by a depolarizing current. … When the depolarization reaches about -55 mV a neuron will fire an action potential.
Which statement is true regarding the neuron synapse quizlet?
Which statement is true regarding the neuron synapse? Binding of a neurotransmitter on the postsynaptic neuron membrane can generate an action potential in the neuron. Action potential is unique to neurons and muscle cells. Other body cells do not use the process.
Which statement is true of neurons?
The correct answer is C. Neuron . Neurons are cells that perform most of the information processing, memory, and communication functions of the nervous system. Neurons are organized into circuits, also called neural pathways.
Which of the following is true regarding action potential propagation?
Which of the following is true regarding action potential propagation? The influx of Na+ from an action potential flows into adjacent membrane areas in both directions. The action potential only moves in one direction, down the axon toward the synapse.