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Threshold in the largest biology dictionary online. Free learning resources for students covering all major areas of biology.
Threshold concepts have been referred to as “jewels in the curriculum”: concepts that are key to competency in a discipline but not taught explicitly. In biology, researchers have proposed the idea of threshold concepts that include such topics as variation, randomness, uncertainty, and scale.
16 Φεβ 2014 · 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.
In electrophysiology, the threshold potential is the critical level to which a membrane potential must be depolarized to initiate an action potential. In neuroscience, threshold potentials are necessary to regulate and propagate signaling in both the central nervous system (CNS) and the peripheral nervous system (PNS).
Threshold traits don't follow the basic Mendelian rules; they're influenced by many genes and by the environment. What does this complexity lead to?
Definition. In the context of nervous tissue function, a threshold is the minimum level of stimulus intensity required to activate or depolarize a neuron, leading to an action potential. It is a critical point that once crossed, results in a significant physiological response within the neuron.
1 Αυγ 2005 · A threshold is the point or range of an independent variable (e.g., a micro-environmental variable) beyond which there is a dramatic change in the relationship between the...
