निम्नलिखित में से कौन सी कोशिका प्रकार मानव शरीर को अनुकूलन शील प्रतिरक्षा (adaptive immunity) प्रदान करने के लिए सबसे सीधे तौर पर 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 ________.