ब्रूनर की ग्रंथियां (Brunner's glands) मुख्य रूप से निम्नलिखित में से किस क्षेत्र में पाई जाती हैं?

Which digestive hormone inhibits both gastric secretion and motility, stimulates insulin release, and is secreted mainly when fat is present in the duodenum?

The repeated sequence of gradual onset of apnoea followed by gradual restoration of respiration is called ________.