निगलते समय भोजन को श्वास नली में प्रवेश करने से रोकने वाली फ्लैप जैसी कार्टिलाजीनस संरचना कौन सी 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 ________.