BIOLOGICAL BASES OF BEHAVIOR
NEUROTRANSMISSION
|
Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
|
|
|
a neural impulse
|
|
|
a level of stimulation needed to trigger a neuron
|
|
|
a period of brief resting pauce after a neuron has fired
|
|
|
the junction between the axon and the dendrite
|
Detailed explanation-1: -Threshold. Definition: The membrane voltage that must be reached in an excitable cell (e.g., neuron or muscle cell) during a depolarization in order to generate an action potential. At the threshold voltage, voltage-gated channels become activated. Threshold is approximately −50 to −40 mV in most excitable cells.
Detailed explanation-2: -The stimulus threshold of the neuron refers to the: minimum level of stimulation required to activate a particular neuron.
Detailed explanation-3: -Action potentials are triggered when an initial depolarization reaches threshold. This threshold potential varies, but generally is about 15 millivolts above the cell’s resting membrane potential, occurring when the inward sodium current exceeds the outward potassium current.
Detailed explanation-4: -Threshold potential is the minimum potential difference that must be reached in order to fire an action potential. For most neurons in humans, this lies at-55 mV, so a signal to a resting cell must raise the membrane potential from-70 mV.