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.
This process is called natural selection.
With that said, it means that the organisms with the less favorable traits to the environment had a less chance of surviving and they are less likely to pass their characteristics to the next generation as they have a lower chance of reproducing.
For example, there are black moths and white moths. The black moths can camouflage themselves in the dark environment, meanwhile the white ones can be easily spot by predators. Therefore, the number of white moths decreases because predators caught them. The leads to more black moths around and less white ones.
It would slow down in the stage of growing or
The role of the Hemoglobin Carries oxygen through the blood and a small amount of carbon dioxide.
The cell membrane that helps to control what enters and leaves a cell is the outer boundary of the cytoplasm