सिगरेट पीने से रक्त की ऑक्सीजन ले जाने की क्षमता मुख्य रूप से किसके कारण कम हो जाती 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 ________.