In a billiards game, the white cue ball hits the black ball, moving the black ball to the right while the cue ball moves to the left. If the action
force is applied by the cue ball to the black ball, which force is the
reaction force?
Select one
the force applied to the black ball by the cue ball
the force applied by the stick to the cue ball
the friction applied by the table to the cue ball
the force of gravity on the cue ball

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).