After (1) electrical stimulation, the leg contraction reflex appeared rapidly in the right hind limb, indicating that the nerve regulation has the characteristics of rapidity. Through the analysis of the changes of left and right hind limbs, it can be known that neural regulation has the characteristics of accuracy.

(2) In order to make skeletal muscle contraction promote muscle cells to synthesize and secrete IL-6 in large quantities, the corresponding mRNA must be synthesized in skeletal muscle cells first, so the reason for detecting IL-6mRNA content in the experiment is that IL-6mRNA is a template for synthesizing IL-6, so the change of IL-6mRNA content can explain the change of IL-6 content, and the experiment must have a control device. Here, the IL-6mRNA of uncontracted skeletal muscle cells in the corresponding part of the opposite side can be detected as a control. If the IL-6mRNA content of contracted skeletal muscle cells is significantly higher than that of non-contracted skeletal muscle cells, this hypothesis holds.

(3) According to the meaning of the question, since IL-6 acts on the liver to increase the blood sugar concentration, it should promote the decomposition of liver glycogen and act on skeletal muscle to provide energy for muscle contraction, so it should accelerate the intake and utilization of glucose.

So the answer is:

(1) Fast and accurate (accurate and limited in scope)?

(2)IL-6mRNA is a template for synthesizing IL-6, so the change of IL-6mRNA content can explain that the change of IL-6 content does not shrink the skeletal muscle cells in the corresponding part of the contralateral side. The content of IL-6mRNA in contracted skeletal muscle cells was significantly higher than that in uncontracted skeletal muscle cells.

(3) Hepatic glycogen decomposition? Intake and utilization (oxidative decomposition)