Help me ASAP What happens to the actin and myosin during a muscle contraction?

•The actin filaments push against the myosin filaments, making the myosin filaments smaller

•The actin filaments are forced inward by the flexing of the muscle

•The myosin filaments remain in place as they pull the actin filaments inward

•The myosin filaments compress the actin filaments, making the actin filaments smaller

Choose the incorrect statement (a) the motor end plate membrane is only capable of generating graded potentials, but it is contiguous with the skeletal muscle sarcolemma, which can generate action potentials. (b) propagation of an action potential through the t-tubules into the sarcoplasmic reticulum triggers the release of ca++ into the cytoplasm of a skeletal muscle fiber. (c) the generation of suprathreshold endplate potentials in multiple muscle fibers could be due to the increased frequency of action potential generation at the axon hillock of a single motor neuron. (d) a greater amount of ach would be found in the presynaptic vesicles of a motor unit that fired several action potentials after exposure to botulinum toxin, than in a motor unit that fired several action potentials after exposure to the venom of the krait snake (which contains α-bungarotoxin).