Search results
Results from the WOW.Com Content Network
Depolarization is essential to the function of many cells, communication between cells, and the overall physiology of an organism. Action potential in a neuron, showing depolarization, in which the cell's internal charge becomes less negative (more positive), and repolarization, where the internal charge returns to a more negative value.
A neuron receives signals from neighboring cells through branched, cellular extensions called dendrites.The neuron then propagates an electrical signal down a specialized axon extension from the basal pole to the synapse, where neurotransmitters are released to propagate the signal to another neuron or effector cell (e.g., muscle or gland).
These neurotransmitters bind to receptors located on the postsynaptic membrane of the lower neuron, and, in the case of an excitatory synapse, may lead to a depolarization of the postsynaptic cell. An excitatory synapse is a synapse in which an action potential in a presynaptic neuron increases the probability of an action potential occurring ...
If a graded potential is strong enough, or if several graded potentials occur in a fast enough frequency, the depolarization is able to spread across the cell body to the axon hillock. From the axon hillock, an action potential can be generated and propagated down the neuron's axon , causing sodium ion channels in the axon to open as the ...
Neural accommodation or neuronal accommodation occurs when a neuron or muscle cell is depolarised by slowly rising current (ramp depolarisation) in vitro. [1] [2] The Hodgkin–Huxley model also shows accommodation. [3]
"Hearst Magazines and Yahoo may earn commission or revenue on some items through these links." Alzheimer's disease is the most common form of dementia, affecting more than three million Americans ...
A teacher and a teenage student were killed in Monday’s shooting at the Abundant Life Christian School in Madison. Two students are in critical condition and four other students suffered non ...
Although voltage-gated ion channels are typically activated by membrane depolarization, some channels, such as inward-rectifier potassium ion channels, are activated instead by hyperpolarization. The gate is thought to be coupled to the voltage sensing regions of the channels and appears to contain a mechanical obstruction to ion flow. [11]