According to Muscle Physiology from the University of California, San Diego, ATP supplies the energy needed by muscles to contract. Ironically, ATP is also needed for muscle relaxation. The chemical stimulates muscle relaxation by disconnecting myosin and actin.Continue Reading
ATP, also known as adenosine triphosphate, is the primary source of energy for many body functions, muscle contraction included, notes Wikipedia. According to Muscle Physiology, muscle contraction and relaxation are achieved through the Lymn-Taylor actomyosin ATPase hydrolysis mechanism. Scientists have yet to fully uncover the link between the Lymn-Taylor actomyosin ATPase hydrolysis mechanism and the mechanical cross-bridge function that also plays a critical role in muscle contraction. However, Lymn and Taylor, the scientists behind the discovery of the Lymn-Taylor actomyosin ATPase hydrolysis mechanism theorize that ATP plays its role through a process that is broken into four parts.
First, ATP binds to myosin, breaking down an actin-myosin bridge and causing muscle contractions to stop. The free myosin and its bridge then move to a point where they can attach to actin. At this point, ATP is broken down into adenosine diphosphate and Pi, generating energy, explains Muscle Physiology. ADP, Pi and the myosin bridge then attach to actin, causing muscle contraction. During the muscle relaxation phase, actin displaces ADP and Pi at the myosin cross bridge. ADP and Pi are then reconstituted into ATP by the body, and the process starts again. Muscle contraction also requires the brain, the nervous system and other body systems to function properly.Learn more about Muscles
Tonic smooth muscles show continuous contraction as fluids move around them, while phasic smooth muscles show rhythmic motions that cease after a time, according to class notes from Florida State University College of Medicine. Phasic smooth muscles include those within the wall of the stomach, and tonic smooth muscles are found in arteries.Full Answer >
A skeletal muscle twitch is shorter than a tetanic contraction, according to Dr. Paul Deeble of Mary Baldwin College. A twitch contraction is a short, jerky movement in response to a single stimulus in a muscle fiber. A tetanic contraction happens after several stimuli cause a muscle to contract in rapid succession.Full Answer >
Muscle cells produce ATP anaerobically during periods of rapid exercise. ATP is the energy needed for cellular activity to occur. Generally oxygen is used to produce ATP in a process called aerobic respiration. When oxygen is not available to break down the carbohydrates that enable muscle contraction, the body continues to create ATP through anaerobic respiration. Anaerobic respiration results in less ATP production and in the waste product lactic acid.Full Answer >
As the Stanford Visible Female explains, a gluteal muscle diagram is a 3D image of the muscles in the buttocks. According to My Weight Lifting, a diagram of the gluteal muscle should include the three gluteal muscles: the gluteus maximus, gluteus medius and the gluteus minimus.Full Answer >