दो तंत्रिका कोशिकाओं (neurons) के बीच के जोड़ या खाली स्थान को क्या कहा जाता 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 ________.