Graded potential

Graded potentials are changes in membrane potential that vary in size, as opposed to being all-or-none. They arise from the summation of the individual actions of ligand-gated ion channel proteins, and decrease over time and space. They do not typically involve voltage-gated sodium and potassium channels. These impulses are incremental and may be excitatory or inhibitory. They occur at the postsynaptic dendrite as a result of presynaptic neuron firing and release of neurotransmitter, or may occur in skeletal, smooth, or cardiac muscle in response to nerve input. The magnitude of a graded potential is determined by the strength of the stimulus.

单词	Graded potential
释义	Graded potential 原声例句 Crash Course 解剖生理学篇 That influx of sodium then generates graded potentials, which might lead to action potentials, and now your nervous system knows what's going on. 钠的流入会产生分级电位，这可能会导致动作电位，现在你的神经系统知道发生了什么。 Crash Course 解剖生理学篇 And louder sounds move the hair cells more, which generates bigger graded potentials, which in turn generate more frequent action potentials. 声音越大，毛细胞运动得越厉害，从而产生更大的分级电位，进而产生更频繁的动作电位。 Crash Course 解剖生理学篇 For example, salty things are full of positively-charged sodium ions that cause sodium channels in the gustatory cells to open, which generate a graded potential, and spark an action potential. 例如，咸的东西充满带正电荷的钠离子，导致味觉细胞中的钠通道打开，从而产生分级电位并激发动作电位。英语百科 Graded potential Graded potentials are changes in membrane potential that vary in size, as opposed to being all-or-none. They arise from the summation of the individual actions of ligand-gated ion channel proteins, and decrease over time and space. They do not typically involve voltage-gated sodium and potassium channels. These impulses are incremental and may be excitatory or inhibitory. They occur at the postsynaptic dendrite as a result of presynaptic neuron firing and release of neurotransmitter, or may occur in skeletal, smooth, or cardiac muscle in response to nerve input. The magnitude of a graded potential is determined by the strength of the stimulus.
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