थायराइड ग्रंथि के सामान्य कामकाज के लिए निम्नलिखित में से कौन सा तत्व आवश्यक है?

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 ________.