A: A Twitch
A single contraction that lasts only a fraction of a second is called a muscle twitch. Its when the muscle seizes up for a quick pulse then relaxes.
The contractile response of a single muscle fiber to a single muscle impulse is called a "twitch." A twitch consists of a brief contraction followed by relaxation, and it can be divided into three phases: the latent period, contraction phase, and relaxation phase. The characteristics of a twitch, such as its duration and force, can vary depending on the type of muscle fiber involved.
constant contraction of a muscle is called the muscle tone
A muscle twitch refers to a single, quick contraction and relaxation of a skeletal muscle in response to an electrical stimulus. In a laboratory setting, researchers can analyze the characteristics of the twitch, such as its duration, force, and the time between the stimulus and contraction (latency). This helps in understanding muscle physiology and the mechanisms of muscle contraction.
A twitch contraction is a single, brief contraction of a muscle fiber in response to a stimulus. It is the smallest unit of muscle contraction and is not strong enough to produce movement of a limb.
It is called concentric isotonic contraction.
An involuntary muscle contraction is called a spasm.
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tetanic contraction.
Tonus is the continous baseline muscle tone in the body.
Spasm
The response of a motor unit to a single action potential of its motor neuron is called a muscle twitch. This involves the contraction of all the muscle fibers within the motor unit in response to the stimulation from the motor neuron.