Please help i am giving away brainliest Which of the following best describes the role of the nervous system?

A. responds to all internal and external stimuli

B. detects only stimuli from outside an organism

C. responds only to stimuli occurring inside an organism

D. detects internal and external stimuli at the cellular level

No dam links

A

Explanation:

the abdomen (less formally called the belly, stomach, tummy or midriff) constitutes the part of the body between the thorax (chest) and pelvis, in humans and in other vertebrates. the region occupied by the abdomen is termed the abdominal cavity. the stomach secretes acid and enzymes that digest food. ridges of muscle tissue called rugae line the stomach. the stomach muscles contract periodically, churning food to enhance digestion. the pyloric sphincter is a muscular valve that opens to allow food to pass from the stomach to the small intestine.

answer: substrate concentration. enzymes work best when there is a high enough substrate concentration for the reaction they catalyse.