Muscle cramps are caused when the muscle takes longer than normal to relax after a contraction. During contraction, the myosin heads attach on their binding sites on the actin filament and pulls on the filament hence shortening the sarcomeres. For the myosin head to release its binding site on the actin filament, ATP attaches to an active site on the myosin and is hydrolyzed to ADP and Pi. This causes relaxation after a contraction cycle. Cramps, therefore, may be due to depletion of ATP molecule in the muscles cells.
Another reason for cramps may be a high amount of calcium in the muscles that bind to troponin on the actin filaments. This exposes the myosin binding sites longer hence promotes the formation of cross-bridge even when the contraction of the muscle is not intended anymore.
<span>A
mineral has to be naturally occurring, inorganic, solid, have a crystal
structure, and have a definite chemical composition. Coal is not a
mineral because it is carbon-based and came from fossilized plants. That
proves that it is organic and has no definite chemical composition,
defying two rules you would need to follow to be a mineral. Glass is a
non-crystalline solid. This means that the atoms are not arranged in a
regular and repeating pattern. A mineral by definition possess a
crystalline form, it has its elements arranged in a regular and
repeating pattern.</span>
Answer:
ojala te sirva no soy de Argentina pero bueno eso es lo que creo
Explanation:
toda substancia o mezcla de substancias naturales o elaboradas que, ingeridas por el hombre, aporten a su organismo los materiales y la energía necesarios para el desarrollo de sus procesos biológicos,ojala te sirva.
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Answer:
the structure is external gills
Explanation:
