18 Questions
What is unique about the connection between cells in the nervous system?
One cell is connected to thousands of other cells.
What type of potential can occur during depolarization or hyperpolarization?
Graded Potential
What happens when two graded potentials are added together?
They are added together
What determines the strength of a depolarizing graded potential?
Size of the stimulus
What happens when a stimulus causes a depolarization above the threshold?
An action potential is triggered
What is true about the duration of a stimulus and the resulting depolarization?
A longer stimulus duration causes a longer lasting depolarization
What is the primary function of dendrites in a neuron?
To receive signals from other neurons
What is the role of the axon hillock in a neuron?
To generate action potentials
What is the primary function of the axon terminals in a neuron?
To transmit messages to other cells
What is the purpose of the myelin sheath on an axon?
To insulate and facilitate signal conduction
What is the function of the cell body in a neuron?
To house the nucleus and other organelles
What is the term for the signals sent from the axon terminals to other cells?
Neurotransmitters
What is the term for the process where stimuli are spaced out and generate an action potential?
Spatial Summation
What is the result of an excitatory presynaptic input?
Depolarization
What is the threshold potential for the opening of Na+ channels?
-55 mV
What is the result of an inhibitory presynaptic input?
Hyperpolarization
What is the term for the electrical impulses transmitted along nerve fibers?
Action Potential
What happens to K+ permeability during depolarization?
It decreases
Understand how neurons interact with each other, including converging and diverging connections, and the role of graded potentials in neural signaling. Learn about the passive and energy-independent nature of graded potentials and their significance in depolarization and hyperpolarization. Explore the complex communication network of neurons and their cell bodies.
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