Question

ATPase enzyme needed for muscle contraction is located in:

• A. Actin
• B. Actinin
• C. Myosin
• D. Troponin

Answer 1

The correct option is C

Myosin

The correct option is C.

Explanation of the correct option:-

1. Actin and myosin filament interaction, which causes their movement in relation to one another, causes muscle contraction.
2. Myosin's association with actin filaments, which enables it to operate as a motor to promote filament sliding, provides the chemical basis for this relationship.
3. Myosin cross crosses the heads as the muscle contracts. It has an ATPase that is triggered by Ca2⁺and Mg2⁺ ions as well as an actin-binding protein. Myosin thus contains the ATPase enzyme.

Explanation of the incorrect options: -

Option A:-

1. All eukaryotic cells contain the highly abundant intracellular protein actin, which is essential for both cell and muscle movement and contraction.
2. Actin is crucial for preserving and regulating the architecture and structure of cells.

Option B:-

1. Actinin mainly affects the cytoskeleton's cohesiveness and dynamics by cross-linking actin filaments and other elements of the cytoskeleton to produce a scaffold that lends stability and acts as a link between the cytoskeleton and signalling pathways.
2. Actinin can be found in adhesion sites as well as along actin filaments. It is located in the Z-disk and related dense bodies in smooth, cardiac, and striated muscle cells, where it creates a lattice-like structure and stabilizes the muscle contractile system.

Option D: -

1. Our heart's muscles contain a particular kind of protein called troponin. Blood often does not contain troponin.
2. Troponin is released into the bloodstream when the heart muscles are harmed. Greater levels of troponin are released into the circulation as the cardiac injury progresses.

Final Answer: - ATPase enzyme needed for muscle contraction is located in Myosin.