The distance between these structures shorten during a muscle contraction.

Is the answer thick filaments(myosin) and thin filament(actin)?

Yes, the structures you are referring to are the thick filaments (composed of myosin) and the thin filaments (composed of actin). During a muscle contraction, these filaments slide past each other, which shortens the overall length of the muscle.

To determine this answer, you can rely on your knowledge of muscle anatomy. A muscle contraction involves the interaction between myosin and actin filaments. The myosin heads on the thick filaments bind to actin molecules on the thin filaments, forming cross-bridges. These cross-bridges undergo a series of molecular interactions and movement, resulting in the sliding of the filaments towards the center of the sarcomere (the basic contractile unit of a muscle). This causes the sarcomere to shorten, leading to overall muscle contraction. Therefore, it can be concluded that the distance between thick and thin filaments shortens during muscle contraction.