1. Contraction
2. Actin
3. Tendons
4. Epidermis
5. Dermis
6. Acne
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.
For Penn Foster.
An energy resource that can be replaced by nature in a relatively short time is known as a "<span>inexhaustible energy resource" but these are very rare in nature. </span>
The process of cellular differentiation is a direct result of a differiental
B. sulfur tetrafluoride + water → hydrogen fluoride + sulfur dioxide
Every 3 days the stomach starts a new lining
