BIOLOGY 12TH ED (LL) W/ CONNECT
BIOLOGY 12TH ED (LL) W/ CONNECT
12th Edition
ISBN: 9781264898091
Author: Raven
Publisher: MCG
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Chapter 45, Problem 1IQ
Summary Introduction

To determine: The cause of the maximum amplitude of a stimulated muscle contraction.

Introduction: Muscle contraction is usually stimulated by the motor neurons, which are known as somatic motor neurons. The contraction and the relaxation in muscles are brought by the actin and myosin filaments.

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Explanation of Solution

When the somatic motor neuron delivers electrochemical impulses, it stimulates the contraction of muscle fibres; it makes the synapses through which muscles are contracted and relaxed. The maximum amplitude of a summated muscle contraction is caused due to the persistence of stimulus. When the stimulus persists for a long time, the amplitude of the muscle contraction also gets maximized. This is due to the stimulation of muscles by the electrical or natural stimulation of the neurons. Tetanus is one of the examples that has maximum amplitude during muscle contraction.

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