Motion paths move things. There are also a whole load of other "emphasis" effects in powerpoint that may be used in combination with motion paths to create all sorts of effects.
There follows a seleciton of animations, most of which use various of the animation tools in combination
Moving and shrinking
For example, simultaneous application of a motion path and a change in size can create the illusion of an object escaping into the distance.
Used here to good effect on another variation on my "Next Time" slide. BTW using an "animated gif" as a moving object adds a whole other dimension....
Here we zoom in and out around glomerular capillaries. Like many of the animations, it makes more sense with an explanation.
Here is an introduction to vertebrae..... Did you notice the eyes?
Here is an animation of the nerve impulses behind breathing, in real time.