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How does increasing myosin-atpase activity affects muscle contractions?
Increasing myosin ATPase activity enhances the speed and efficiency of muscle contractions. Myosin ATPase is responsible for hydrolyzing ATP, providing the energy required for the myosin heads to detach and reattach during the cross-bridge cycle. This results in quicker and more forceful contractions, allowing for improved performance in activities requiring rapid or prolonged muscle engagement. Overall, higher myosin ATPase activity contributes to greater muscle power and endurance.
What are the key steps involved in the crossbridge cycle during muscle contraction?
During the crossbridge cycle in muscle contraction, the key steps involve the binding of myosin to actin, the power stroke where the myosin head pivots and pulls the actin filament, the release of ADP and inorganic phosphate, and the resetting of the myosin head for the next cycle.
During which 2 periods of the cardiac cycle do the heart muscle fibers exhibit isometric contractions?
Isovolumetric contraction and Isovolumetric Relaxation
What is the name given to contraction phase of the cardiac cycle?
The contraction phase of the cardiac cycle is called systole. This is when the heart muscle contracts to pump blood out of the heart and into the circulatory system.
What is the time in which cross bridges are active called?
The time in which cross bridges are active during muscle contraction is called the "cross-bridge cycle." This cycle involves the binding of myosin heads to actin filaments, power stroke generation, and detachment of the cross bridges.
What is a cross bridge in a muscle contraction?
A cross bridge in muscle contraction refers to the temporary connection formed between the myosin heads of thick filaments and the actin filaments of thin filaments within a muscle fiber. This interaction occurs during the contraction cycle when calcium ions bind to troponin, causing tropomyosin to shift and expose binding sites on actin. The myosin heads then attach to these sites, pulling the actin filaments toward the center of the sarcomere, which leads to muscle shortening and contraction. This process is a key component of the sliding filament theory of muscle contraction.
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.
Give examples for concentric and eccentric muscle contractions in gait cycle?
while kicking a football, the Quadriceps muscle contracts concentrically to straighten the knee and the Hamstrings contract eccentrically to decelerate the motion of the lower limb.In concentric muscle contraction muscle length decreases along with contraction of the fibres while in eccentric muscle contraction the muscle length increases.Dr Santosh
What is a rhythmic contraction?
A rhythmic contraction refers to a repeated pattern of muscle contractions at regular intervals. This can occur in various muscles in the body, including the heart muscle during the cardiac cycle. Rhythmic contractions are important for fundamental physiological processes such as pumping blood or generating movement.
What happens during the T wave of the cardiac cycle?
During the T wave of the cardiac cycle, the ventricles of the heart repolarize, meaning they reset their electrical charge in preparation for the next heartbeat. This phase represents the relaxation and recovery of the heart muscle after contraction.
What is the phase of the cardiac cycle that is caused by the sliding of actin and myosin?
The phase of the cardiac cycle caused by the sliding of actin and myosin is systole. During systole, the heart muscle contracts to pump blood out of the heart into the circulation. This contraction is driven by the sliding of actin and myosin filaments in the cardiac muscle cells.
What is the correct phase order of the stretch shortening cycle?
The correct phase order of the stretch-shortening cycle is eccentric contraction, amortization phase, and concentric contraction. This sequence allows for energy storage during the eccentric phase, a brief pause to transition from lengthening to shortening, and then rapid muscle shortening in the concentric phase for powerful movement.
