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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.
The strongest muscle contractions are normally achieved by?
Increasing stimulation up to the maximal stimulus
What is an increasingly stronger contractions owing to increased stimulus strength known as?
The phenomenon of increasingly stronger contractions owing to increased stimulus strength is called recruitment. It involves activating more muscle fibers within a muscle to generate greater force in response to a stronger stimulus.
Why dont your eyes adapt completely to a repeated visual stimulus?
Our eyes adapt completely to repeated visual stimulus because
When the intensity of contractions increases will the stimulus increase the intensity of contractons?
When the intensity of contractions increases, the stimulus does not necessarily increase the intensity of contractions further. Instead, the force of muscle contractions is primarily regulated by the frequency of stimulation and the recruitment of motor units. If the stimulation remains constant but the contraction intensity increases, it may indicate that the muscle is responding more efficiently or that more motor units are being activated. Thus, the relationship between stimulus and contraction intensity can be complex and depends on various physiological factors.
How is wave summation achieved in vivo?
simply: Wave summation occurs when a second stimulus is applied before relaxation occurs completely. In depth: In order for a muscle to contract electrical shock or nerve impulse must cause voltage-sensitive tubule proteins (T-tubules) of sarcoplasmic reticulum to change shape and allow Ca2+ into cytosol. Ca2+ binds to troponin (changing its shape) allowing myosin (makes thick filaments) to attach to actin ( makes thin filaments). Myosin pulls itself along actin via ATP hydrolysis, this is called a cross bridge cycle, basically shortening of muscle. Before the contraction stops, another stimulus is sent to the muscle allowing more Ca2+ into the cytosol which keeps allowing cross bridge cycle. wave summation means the contractions are added together. thus increasing the force of the second stimuli. force will increase until the muscle reaches its threshold.
How might a person exhibit positive feedback communication?
Positive feedback increases the original stimulus. An example is labor contractions. The initial contraction signals the body to release hormones that increase the frequency and intensity of subsequent contractions.
The strongest muscle contractions are normally achieved by what?
The strongest muscle contractions are normally achieved by increasing the stimulation up to the maximal stimulus. There are various classifications of contractions, including eccentric and concentric.
Why does varying stimulus strength affects the twitch force?
Varying stimulus strength affects twitch force because it determines the number of motor units that are recruited to contract the muscle fibers. As the stimulus strength increases, more motor units are recruited, leading to greater force production. Conversely, lower stimulus strength recruits fewer motor units and results in weaker contractions.
How does the frequency of stimulation affect the amount of force generated by the muscle?
Increasing the stimulus to an isolated muscle increases the strength of a contraction. A muscle begins to contract when the stimulus is given; however, if the muscle does not finish contracting before the next stimulus hits, then the force of the contraction will increase to finish the contraction. This is known as wave summation.
If a second stimulus arrives before the relaxation phase has ended a second more powerful contraction occurs this is called what?
In fact it is not treppe it is wave summation. 4th year bio med! I KNOW MY STUFF!!
What property of smooth and cardiac muscles allows them to initiate their own contractions?
The property of automaticity allows smooth and cardiac muscles to spontaneously initiate their own contractions without needing an external stimulus. This is due to the presence of pacemaker cells in these muscle tissues that can generate action potentials independently.
