Which molecule blocks the myofilaments, actin and myosin, from interacting, and how is it moved when you want to contract a muscle

tropomyosin

Explanation:

Tropomyosin is an elongated (α-helical coiled-coil) molecule that controls muscle contraction by blocking the binding of myosin to actin, thereby preventing cross-bridge formation required for muscle contraction. Tropomyosin is removed during muscle contraction, which is initiated by the release of calcium ions (Ca 2+) from the sarcoplasmic reticulum. Moreover, the complex troponin (composed of troponin C, troponin I, and troponin T proteins) binds to tropomyosin and helps to localize it on the actin filament.

here's your

hope it

there are 35 white marbles

step-by-step explanation:

y- yellow marbles

4y + 5 = 45

subtract 5 from both sides

4y = 40

divide for from both sides

y = 10

plug in 10 to get 40 yellow marbles then subtract by 5 to get 35 marbles

thus there are only 10 yellow marbles