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What can happen when a muscle is stimulated before the muscle can fully relax?
When a muscle is stimulated before it can fully relax, it can lead to a phenomenon called tetanus, where the muscle fibers do not have enough time to relax between contractions. This results in a sustained contraction, which can increase muscle tension and force production. If this stimulation continues, it may lead to fatigue, muscle soreness, or damage due to excessive tension and energy consumption. Ultimately, the muscle's ability to function effectively can be compromised.
What is post-systolic potentiation?
Because the PVC (premature ventricular contraction) comes early, there is more time before the next beat, meaning that there is more time for the heart to fill. Because of more filling, there is more initial tension on the cardiac muscle, eliciting a stronger contraction from the heart. Also, the PVC is a weak contraction, so the heart does not fully empty, and there is more residual blood in the heart even before it starts filling again.
Do Muscle organs obey the all-or-none law?
Yes, muscle fibers obey the all-or-none law, which states that when a muscle fiber is stimulated to threshold, it will contract fully; if the stimulus is below threshold, it will not contract at all. This principle applies to individual muscle fibers, but whole muscles can exhibit graded responses based on the number of fibers recruited and the frequency of stimulation. Thus, while each muscle fiber follows the all-or-none law, the overall muscle action can vary in strength.
This area disappears in a fully contracted muscle?
H zone
Can wave summations go on infinitely?
Wave summations, particularly in the context of muscle contractions, can theoretically continue as long as the muscle fibers are stimulated before they can fully relax. This leads to a cumulative effect where each successive stimulus adds to the previous ones, resulting in increased tension. However, in practical terms, there are physiological limits due to factors like fatigue and depletion of energy resources, which prevent indefinite summation. Thus, while wave summation can occur in rapid succession, it cannot go on infinitely in a biological system.
What Causes muscle cramps when stretching?
Dehydration - make sure you're fully hydrated before working out or exercising and continue to replenish by drinking water during the exercise.
Which type of muscle tissue responds the fastest to stimulations to contract?
The answer is smooth muscle.The muscle tissue of a fully active brain will reproduce instantaneously; if damaged during exercises, as the brain has the most potential, and is fully alert of all of its operation perimeters: when performing at full power, and processing within parameters!
What does it mean to precondition batteries?
By fully charging and fully discharging some batteries the expected charge time can be increased. Some rechargable batteries will last longer per charge if they are fully discharged before you recharge them again. Recharging batteries before they are fully discharged may cause a battery memory effect that will allow the battery to run for a shorter period between recharges.
Examples of passive insufficiency?
In the hamstrings, passive insufficiency occurs when the muscle is unable to fully elongate because the knee is extended and the hip is flexed. In the quadriceps, passive insufficiency happens when the muscle is unable to fully elongate because the knee is flexed and the hip is extended. In the gastrocnemius, passive insufficiency occurs when the muscle is unable to fully elongate because the ankle is dorsiflexed.
Why can't doms straighten their arm?
Doms, or delayed onset muscle soreness, occurs when muscles are overworked or strained. When a muscle is sore, it may be difficult to fully straighten the arm due to inflammation and muscle tightness. This can limit the range of motion and make it uncomfortable to fully extend the arm.
What are the problems when a muscle over contracts?
A fully contracted muscle that remains in tetanus for a prolonged period can cramp, tear, and pull tendons from their insertions.
What muscle is pulled when the knee is forced into extension when the hip is already fully flexed?
the hamstrings :)
