When skeletal muscle is stimulated by a series of closely...

Name: Problem 6, Chapter 40: Biology
Uploaded: 2021-08-25T16:59:23-08:00
Duration: 5 min 9 s
Channel: Caroline Jones
Description: When skeletal muscle is stimulated by a series of closely timed separate stimuli, (a) white fibers respond (b) a simple twitch occurs (c) the muscle responds with a smooth, sustained contraction called tetanus (d) red fibers respond (e) summation is inhibited

When skeletal muscle is stimulated by a series of closely timed separate stimuli, (a) white fibers respond (b) a simple twitch occurs (c) the muscle responds with a smooth, sustained contraction called tetanus (d) red fibers respond (e) summation is inhibited

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Key Concepts

Muscle Twitch

A muscle twitch is the basic, single-contraction response of a muscle fiber to a brief electrical stimulus. It encompasses the contraction and subsequent relaxation phases and represents the fundamental unit of muscle mechanical activity.

Temporal Summation

Temporal summation occurs when a series of stimuli are delivered in rapid succession, such that the individual twitches overlap and add together. This additive effect increases the force of contraction beyond that of a single twitch.

Tetanus

Tetanus in muscle physiology refers to a sustained, smooth contraction that results from high-frequency stimulation. The individual twitches fuse into one prolonged contraction when the stimulation rate is high enough to prevent any relaxation between stimuli.

Muscle Fiber Types

Skeletal muscle fibers are generally classified into different types (commonly fast-twitch or 'white' fibers and slow-twitch or 'red' fibers) that have distinct physiological properties. These differences, such as contraction speed and fatigue resistance, are important in understanding how muscles respond to different patterns of stimulation.

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