Unidade Motora

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Aula I de neurologia
Chicletonha Pérola Alves de Freitas Ribeiro
Flashcards by Chicletonha Pérola Alves de Freitas Ribeiro, updated more than 1 year ago
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What are the characteristics of Type I muscle fibers? Type I muscle fibers are highly fatigue-resistant, rely on oxidative metabolism for energy, are highly vascularized, and contract at a slower rate.
What are the characteristics of Type II muscle fibers? Type II muscle fibers are less fatigue-resistant, rely on glycolytic metabolism for energy, contract at a faster rate, and produce lactic acid.
What is the principle of size in muscle force control? The principle of size, also called recruitment, states that when we start with a light force and progress to intense force, we initially activate small alpha motor neurons. This is because the smaller size guarantees a lower excitability threshold, and as the force increases, we recruit larger alpha motor neurons with higher excitability threshold.
What is the second mechanism of force gradation? The second mechanism of force gradation is the frequency of discharge. After the recruitment of small alpha motor neurons for light movements, we see a sequence of action potentials per minute for the region of 5-20 Hz. As we recruit larger alpha motor neurons, we see an increase in the discharge frequency to 20-50 Hz.
O que são fusos musculares? O que acontece quando ocorre um estiramento muscular? Os fusos musculares são receptores sensitivos sensíveis a alterações de comprimento do músculo. O potencial de ação gerado pelo fuso muscular chega ao corpo celular de seu neurônio no gânglio da raiz dorsal.
Como o sistema GAMA atua no fuso muscular O sistema GAMA inerva o fuso muscular com motoneurônios que atuam independentemente do estiramento, controlando o fuso.
Qual é a função do sistema GAMA no músculo? A função do sistema GAMA no músculo é manter constante a capacidade de ativação do fuso muscular, corrigindo as contrações com relaxamentos e permitindo que o fuso atue.
Como o sistema GAMA garante precisão ao comprimento do músculo? O sistema GAMA garante precisão ao comprimento do músculo corrigindo as contrações com relaxamentos, permitindo que o fuso atue e não somente descrevendo se o músculo está contraído ou não.
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