Final answer:
b. The sympathetic system does not contract GI sphincters, decrease blood peristalsis, and secretions.
Step-by-step explanation:
The sympathetic system controls many physiological responses in the body. It is responsible for increasing heart rate and contractility (option a), constricting the bronchial tree (option c), and inhibiting the contraction of bladder and bowel walls while contracting internal sphincters (option d).
Therefore, the correct answer is option b, because the sympathetic system does not contract GI sphincters, decrease blood peristalsis, and secretions.