Question

the sliding filament model of contraction states that ________.
during contraction, the thin myofilaments slide past the thick myofilaments so that the actin and myosin myofilaments overlap to a greater degree
during contraction, the thin myofilaments slide past t tubules so that the z discs are overlapping
during contraction, the thin myofilaments slide past the thick myofilaments so that calcium ions can be released from the sarcoplasmic reticulum
during contraction, the thin myofilaments slide past the thick myofilaments so that the actin and myosin myofilaments no longer overlap

Explanation:

The sliding filament model of muscle contraction states that during contraction, thin myofilaments (actin) slide past thick myofilaments (myosin). This sliding causes an increase in the overlap between actin and myosin, which shortens the sarcomere (the basic unit of muscle contraction). Calcium ions are released from the sarcoplasmic reticulum earlier in the excitation - contraction coupling process (before the actual sliding in the strictest sense of the sliding filament model description). T tubules are involved in transmitting the action potential, not in the direct sliding of filaments for contraction. And the sliding is to increase overlap, not to eliminate it.

Answer:

during contraction, the thin myofilaments slide past the thick myofilaments so that the actin and myosin myofilaments overlap to a greater degree