Asked by Daisy Salcedo on May 22, 2024
Verified
The voltage at a receptor site has just changed from -70 millivolts to -67 millivolts.What will this lead to
A) an absolute refractory period
B) increased likelihood of an action potential
C) decreased likelihood of an action potential
D) a relative refractory period
Absolute Refractory Period
The period immediately following the firing of a nerve fiber when it cannot be stimulated to fire again, no matter how strong the incoming signal.
Action Potential
A momentary change in electrical potential on the surface of a neuron that occurs when it is stimulated and is capable of transmitting a signal along the neuron.
Millivolts
A unit of electric potential equal to one thousandth of a volt.
- Absorb the essential elements of communication between neurons, with a specific focus on action potentials and the process of synaptic transmission.
- Explain the physiological responses to changes in neural activity, such as changes in voltage at receptor sites or the impact of dehydration on sodium levels.
Verified Answer
GS
Geralyn SinnetteMay 22, 2024
Final Answer :
B
Explanation :
A change from -70 mV to -67 mV represents a depolarization (i.e. the inside of the cell becomes less negative than the resting state). This makes it more likely that the neuron will reach the threshold for an action potential, and thus increase the likelihood of an action potential occurring.
Learning Objectives
- Absorb the essential elements of communication between neurons, with a specific focus on action potentials and the process of synaptic transmission.
- Explain the physiological responses to changes in neural activity, such as changes in voltage at receptor sites or the impact of dehydration on sodium levels.