Question

Thin filaments of muscles contain chains of actin molecules.
a.1
b.2
c.3
d4
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Answer 1

Explanation:

Thin Filaments

The actin molecules contain active sites to which myosin heads will bind during contraction. The thin filaments also contain the regulatory proteins called tropomyosin and troponin, which regulate the interaction of actin and myosin.Thin Filaments

The actin molecules contain active sites to which myosin heads will bind during contraction. The thin filaments also contain the regulatory proteins called tropomyosin and troponin, which regulate the interaction of actin and myosin.

Answer 2

Answer:

b.2

Explanation:

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.