4. Read the given statements and select the correct option....

4. Read the given statements and select the correct option. Statement $1:$ A primary myofilament is composed of a bundle of rod-like molecules of a protein myosin. Statement $2:$ Myosin and actin together form a contractile apparatus. (a) Both statements 1 and 2 are correct and statement 2 is the correct explanation of statement $1 .$ (b) Both statements 1 and 2 are correct but statement 2 is not the correct explanation of statement 1 . (c) Statement 1 is correct and statement 2 is incorrect. (d) Both statements 1 and 2 are incorrect.

4. Read the given statements and select the correct option. Statement $1:$ A primary myofilament is composed of a bundle of rod-like molecules of a protein myosin. Statement $2:$ Myosin and actin together form a contractile apparatus.
(a) Both statements 1 and 2 are correct and statement 2 is the correct explanation of statement $1 .$
(b) Both statements 1 and 2 are correct but statement 2 is not the correct explanation of statement 1 .
(c) Statement 1 is correct and statement 2 is incorrect.
(d) Both statements 1 and 2 are incorrect.

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Key Concepts

Contractile Apparatus

The contractile apparatus refers to the integrated system of proteins, primarily composed of myosin and actin filaments, that drives muscle contraction. The coordinated interaction between these proteins leads to the shortening and relaxation of muscle tissue.

Actin

Actin is a protein that polymerizes to form thin filaments within muscle fibers. Its interactions with myosin, through cycles of attachment, power stroke, and detachment, are central to the mechanism of muscle contraction.

Myofilaments

Myofilaments are the fundamental protein structures within muscle fibers that provide the framework for muscle contraction. They consist of thick and thin filaments arranged in a highly organized pattern, which is essential for the contraction process.

Myosin

Myosin is a type of molecular motor protein that forms the thick filaments in muscle cells. It plays a pivotal role in muscle contraction by interacting with actin, using energy from ATP hydrolysis to generate force and movement.

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