Examlex
Which of these was not a cause of the Panic of 1819,the first real economic depression in America?
Muscle Action
The process of muscles contracting and relaxing to produce movement in various parts of the body.
Tropomyosin
A regulatory protein that wraps around actin filaments in muscle cells, playing a key role in muscle contraction by controlling access to binding sites for myosin.
Sarcomere
The basic contractile unit of muscle fiber, consisting of myofilaments.
Myofilaments
Protein filaments consisting of actin and myosin that interact within muscle cells to cause contraction.
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