The pump is the best way to deliver these proteins and other nutrients to the muscle fibers. Achieving a pump requires strict attention to timing. Filling up your muscles with extra blood is like filling up a bucket with a hole in the bottom. Fluid has to flow into the vessel at a faster rate than flows out of it. That means you can't take a break and start socializing while in the middle of working toward a pump.
Nothing deflates a pump quicker than over-exercising.
But you don't have to cover the full range of motion in every exercise. For example, due to the leverage produced by its insertion at the tendon, the lower part of the biceps near the elbow is weaker than the point midway in the muscle belly. If you always did strict barbell curls with full range of motion, your set would end when the lower part of the muscle, the weakest part, couldn't move the weight anymore. The result is that there is still plenty of potential strength left in the stronger middle part of the muscle, but it is not fully developed. To build muscle, you require a balanced diet that provides approximately 300-500 more calories than your maintenance calorie intake level.