| SECRETIN | Hormone released into the bloodstream by the duodenum |
| PINEAL | Name of the endocrine gland near the centre of the brain that releases melatonin into the bloodstream (6) |
| RENIN | A protein enzyme secreted by the kidneys into the bloodstream (5) |
| GLAND | Any of various organs that synthesize substances needed by the body and release it through ducts or directly into the bloodstream. |
| PINEALGLAND | A pea-sized organ in the brain that secretes melatonin into the bloodstream (6,5) |
| LYMPH | Fluid containing white blood cells that drains into the bloodstream (5) |
| ENDOCRINE | System of glands that secrete hormones directly into the bloodstream (9) |
| SECRETE | Release into the bloodstream, say |
| DRIP | Device that delivers a drug slowly into the bloodstream |
| INTRAVENOUS | Directly into the bloodstream (11) |
| JEJUNUM | What is the part of the small intestine between the duodenum and the ileum? (7) |
| PYLORUS | Muscular opening in the stomach that regulates the passage of partially digested food (chyme) into the duodenum (7) |
| GALLBLADDER | Muscular sac, attached to the right lobe of the liver, that stores bile and ejects it into the duodenum (4,7) |
| EMISSION | A substance or fluid released into the atmosphere (8) |
| EMISSIONS | Substances, gases, etc released into the atmosphere (9) |
| CHINESE | --- lantern, colourful decoration released into the air (7) |
| TRF | Hormone released by the hypothalamus that controls the release of thyroid-stimulating hormone from the anterior pituitary. |
| PANCREAS | Large gland behind the stomach that secretes digestive enzymes into the duodenum (8) |
| BILEDUCT | This conveys a digestive secretion from the liver and the gall bladder to the duodenum (4,4) |
| EXHAUST | System in a petrol/diesel vehicle from which CO2 and other gases are expelled and released into the atmosphere (7) |
