Alrighty. If you gave it some thought, you might have figured out that those exercises are "opposites." They work the muscles that control the appendage on opposite directions. There is a theory, well, it's been proven, Mike Mentzer I believe, but I am not completely sure about that. The muscles "opposite" of another set of muscles will work more effectively and have deeper, faster, more through hypertrophy when one is work right after the other. For example, seated rows and bench press, or lat pull-downs and the negative part of a pull-up. The muscles gets tired quicker and the results of that arranged training makes the muscles work harder. Pairing exercises such as those, if possible, has a better effect.
-Roek
-Roek