एंडोर्फिन (Endorphins) क्या हैं, और व्यायाम के दौरान वे मुख्य रूप से मानव शरीर को कैसे प्रभावित करते हैं?

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 ________.