Human Physio QUIZ
Terms
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- Motor unit
- a motor neuron and all the muscle fibers it innervates
- Twitch
- the mechanical response of a muscle to a single Action Potential
- Threshold stimulus
- The lowest stimulus intensity that triggers a twitch
- Treppe
- increase in muscle tension with repeated twitch contractions
- Summation
- the adding together of twitches that occurs when a muscle is stimulated at high frequency
- Tentanus
- in a muscle being stimulated at high frequency, the plateau phase of the contraction, during which the tension is relatively constant
- Muscle Fatique
- A decline in a muscle's ability to maintain a constant force of contraction in the face of long-term, repetitive stimulation.
- Isometric contraction
- when a muscle contracts, it creates tension but DOES NOT shorten because the load is greater than the force generated by the muscle. ex: when you try to lift an object that is too heacy for you to move
- Isotonic contraction
- When muscle contracts, it generates a tension at least equal to any forces opposing it (called loads - ex is the weight of a barbell), and so the muscle SHORTENS.