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What are the three periods phases in a Myogram?
Title: File:1012 Muscle Twitch Myogram. A single muscle twitch has three components. The latent period, or lag phase, the contraction phase, and the relaxation phase. The latent period is a short delay (1-2 msec) from the time when the action potential reaches the muscle until tension can be observed in the muscle.
What are the three phases of muscle twitch?
A muscle twitch has a latent period, a contraction phase, and a relaxation phase. A graded muscle response allows variation in muscle tension.
What is a Myogram anatomy?
Medical Definition of myogram : a graphic representation of the phenomena (as velocity and intensity) of muscular contractions.
What is Myogram in biology?
Myogenin, is a transcriptional activator encoded by the MYOG gene. Myogenin is a muscle-specific basic-helix-loop-helix (bHLH) transcription factor involved in the coordination of skeletal muscle development or myogenesis and repair. In mice, myogenin is essential for the development of functional skeletal muscle.
What does the latent period on a Myogram indicate?
Figure 15.15. A Myogram of a Muscle Twitch A single muscle twitch has a latent period, a contraction phase when tension increases, and a relaxation phase when tension decreases. During the latent period, the action potential is being propagated along the sarcolemma.
What are the four stages of muscle contraction?
Stimuli Neurotransmitter secretion → Release of calcium → Cross-bridges formation → Excitation of T-system → Sliding of actin filament.
What is a Myogram used for?
An electromyogram (EMG) is a test that is used to record the electrical activity of muscles. When muscles are active, they produce an electrical current. This current is usually proportional to the level of muscle activity. An EMG is also referred to as a myogram.
What does a Myogram indicate about the nature of muscle twitch?
The tension produced by a single twitch can be measured by a myogram, an instrument that measures the amount of tension produced over time (Figure 15.15). Each twitch undergoes three phases.