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.
Answer: It is also known as Metazoa.
Monera − It comprises unicellular organisms, e.g. bacteria.
Protista − Similar to monera (unicellular), but more developed and complex. It contains nucleus.
Plantae − All plants from smallest (such as algae) to the largest (such as Pine, Eucalyptus trees, etc.) are studied...
Fungi − It is a group of eukaryotic organisms that comprises...
Idk what you mean by that and idk what language that is but tbh but I’m awnser my because I want points :)
Or <span>The average density of the boat, including the steel and air, is less dense than 1.00 g/cm³..</span>
