मानव रक्त में ऑक्सीजन के परिवहन के लिए मुख्य रूप से निम्नलिखित में से कौन जिम्मेदार 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 ________.