A sarcomere is the basic contractile unit of muscle fiber. Each sarcomere is composed of two main protein filaments—actin and myosin—which are the active structures responsible for muscular contraction. The most popular model that describes muscular contraction is called the sliding filament theory.
1, heartburn. Keep stomach acid in the stomach!
Answer:
broken windows, flooding, cracked roofs, compromised electrical system
Also breaks spirits
Explanation:
