{"id":164918,"date":"2024-11-10T19:26:31","date_gmt":"2024-11-10T19:26:31","guid":{"rendered":"https:\/\/learnexams.com\/blog\/?p=164918"},"modified":"2024-11-10T19:26:33","modified_gmt":"2024-11-10T19:26:33","slug":"which-of-the-following-correctly-describes-a-graded-potential","status":"publish","type":"post","link":"https:\/\/www.learnexams.com\/blog\/2024\/11\/10\/which-of-the-following-correctly-describes-a-graded-potential\/","title":{"rendered":"Which of the following correctly describes a graded potential"},"content":{"rendered":"\n<p>Which of the following correctly describes a graded potential?<br>A) it has a depolarization, repolarization and hyperpolarization phase<br>B) it can have amplitudes of various sizes<br>C) it is initiated by voltage changes in the membrane<br>D) it travels long distances<\/p>\n\n\n\n<p><strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-ast-global-color-6-color\">The Correct Answer and Explanation is:<\/mark><\/strong><\/p>\n\n\n\n<p>The correct answer is <strong>B) it can have amplitudes of various sizes.<\/strong><\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Explanation:<\/h3>\n\n\n\n<p>Graded potentials are a type of electrical signal that occur in the dendrites and cell body of a neuron. They are <strong>local<\/strong> changes in the membrane potential that vary in size depending on the strength of the stimulus. Unlike action potentials, which are all-or-nothing events, graded potentials have <strong>amplitudes that can vary<\/strong>\u2014hence the term &#8220;graded.&#8221; This means they can be small or large, depending on the intensity of the stimulus that triggered them.<\/p>\n\n\n\n<p>Let\u2019s break down each option:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>A) It has a depolarization, repolarization, and hyperpolarization phase:<\/strong> This statement describes the phases of an <strong>action potential<\/strong>, not a graded potential. While graded potentials can be either depolarizing or hyperpolarizing (depending on whether the membrane potential becomes more positive or more negative), they do not follow the typical three-phase pattern (depolarization, repolarization, and hyperpolarization) seen in action potentials. Graded potentials are not characterized by a fixed sequence of phases.<\/li>\n\n\n\n<li><strong>B) It can have amplitudes of various sizes:<\/strong> This is the correct statement. Graded potentials vary in magnitude depending on the stimulus. For example, a stronger stimulus will produce a larger graded potential, while a weaker stimulus will generate a smaller potential. The amplitude of a graded potential is directly proportional to the strength of the stimulus.<\/li>\n\n\n\n<li><strong>C) It is initiated by voltage changes in the membrane:<\/strong> Graded potentials are typically <strong>initiated by sensory stimuli<\/strong> (e.g., pressure or light) or neurotransmitters binding to receptors, not by voltage changes in the membrane. In contrast, action potentials are initiated by a threshold depolarization that opens voltage-gated ion channels.<\/li>\n\n\n\n<li><strong>D) It travels long distances:<\/strong> Graded potentials <strong>decay over distance<\/strong>. They are localized changes in membrane potential and do not travel long distances like action potentials. The signal weakens as it spreads away from the site of initiation.<\/li>\n<\/ul>\n\n\n\n<p>In conclusion, graded potentials are local changes in membrane potential that vary in size and decrease in strength with distance, making option <strong>B<\/strong> the correct answer.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Which of the following correctly describes a graded potential?A) it has a depolarization, repolarization and hyperpolarization phaseB) it can have amplitudes of various sizesC) it is initiated by voltage changes in the membraneD) it travels long distances The Correct Answer and Explanation is: The correct answer is B) it can have amplitudes of various sizes. 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