Explanation: 7. A nerve signal from the brain arrives at the intersection of the nerve and muscle cells and releases acetylcholine from the neuron. This triggers chemical changes in the muscle cell involving ions, including Ca2+. Calcium triggers the thick filaments, made of myosin, to attach to the thin filaments, made of actin, in the muscle cell, and the myosin pulls the actin toward the center of the muscle cell. ATP causes the release of the actin fibers, allowing the muscle to relax and the process to begin again.
Some wolves may have had variants in their digestion that allowed them to eat wheat, rice, barley, corn, and potatoes, and so they were able to survive with humans.
List of large volcanic eruptions in the 21st century VEI Volcano (eruption). Country 2 Mount Sinabung Indonesia 4 Kelud Indonesia 3 Mount Ontake Japan 4 Calbuco Chile 23 more rows
