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What is the role of ATP in muscle contraction and how does it contribute to the process?
ATP (adenosine triphosphate) is the energy source that powers muscle contraction. When a muscle needs to contract, ATP is broken down into ADP (adenosine diphosphate) and inorganic phosphate, releasing energy that is used to fuel the contraction process. This energy allows the muscle fibers to slide past each other, generating the force needed for movement. In essence, ATP is essential for providing the energy needed for muscle contraction to occur.
What type of energy is lost from a muscle cell during respiration?
During respiration in a muscle cell, the energy lost is in the form of heat. This heat is a byproduct of the metabolic processes that occur to produce ATP for muscle contraction.
What role does calcium and oxygen have in muscle contraction?
Calcium plays a key role in muscle contraction by binding to troponin, which allows tropomyosin to move and expose actin binding sites for myosin. Oxygen is needed in the process of cellular respiration to produce ATP, which is the energy source for muscle contraction to occur efficiently. Oxygen is also used to replenish ATP and remove waste products during muscle activity.
What is an example of energy coupling?
An example of energy coupling is ATP hydrolysis driving an endergonic reaction, such as muscle contraction. Here, the energy released by breaking down ATP is used to power the cellular process of muscle contraction. This coupling of energy allows for the non-spontaneous reaction to occur.
Skeletal muscle twitch differs from a tetanic contraction in that?
Skeletal muscle twitch is a single, brief contraction and relaxation cycle, whereas a tetanic contraction involves sustained, rapid repeated contractions without relaxation in between. Tetanic contractions occur when the muscle is stimulated at a high frequency, leading to a fused contraction.
What is needed besides calcium for contraction to occur?
An action potential. It is the nerve impulse that enters into sarcomeres from the sarcoplasmic reticulum and provides the energy for the calcium ions to briefly bind to the troponin on the actin myofilament to allow for contraction to occur by bringing the Z-lines closer together.
In an isotonic contraction the muscle does what?
In an isotonic contraction, the muscle changes in length while maintaining a constant tension. This allows for movement to occur, such as bending the elbow or lifting a weight.
What chemical reactions occur in the muscle during latent period of muscle contraction?
During the latent period of muscle contraction Ca++ is being released from the sacroplasmic reticulum and filament movement is taking up slack. This takes approx. 2 milliseconds.
Are ATP and calcium both needed for muscle contraction to occur?
look in ur freaken book loser.
How does muscle contraction occurs?
Muscle fiber generates tension through the action of actin and myosin cross-bridge cycling. While under tension, the muscle may lengthen, shorten, or remain the same. Although the term contraction implies shortening, when referring to the muscular system, it means muscle fibers generating tension with the help of motor neurons (the terms twitch tension, twitch force, and fiber contraction are also used).
Would extending be an isotonic contraction?
No, extending a muscle is not considered an isotonic contraction. Isotonic contractions occur when a muscle changes length while maintaining a constant tension, such as during lifting or lowering a weight. In contrast, extending typically refers to the lengthening of a muscle under tension, which can occur during eccentric contractions, where the muscle lengthens while still generating force.
What are the physiological processes that occur in muscle cells and how would you describe them?
Muscle cells undergo a process called muscle contraction, where they generate force and movement. This process involves the interaction of proteins within the cell, specifically actin and myosin, which slide past each other to shorten the muscle fiber. This contraction is triggered by the release of calcium ions within the cell. Additionally, muscle cells also produce energy through the breakdown of ATP to fuel this contraction. Overall, muscle cells work together to create movement and perform various functions in the body.
