define autotrophs. an organism that makes its own food (often by photosynthesis), thereby sustaining itself without eating other organisms or their molecules. Plants, algae, and numerous bacteria are autotrophs. define producers.
Cholecystokinin is produced by I-cells in the lining of the duodenum and is also released by some neurons in the brain. It acts on two types of receptors found throughout the gut and central nervous system. The most recognised functions of this hormone are in digestion and appetite.holecystokinin is produced by I-cells in the lining of the duodenum and is also released by some neurons in the brain. It acts on two types of receptors found throughout the gut and central nervous system. The most recognised functions of this hormone are in digestion and appetite.
Answer by Pluto8888. Confidence votes 204. Red blood cell's organ system is Circulatory. Red blood cells are produced by bone marrow, which is not an organ, but a tissue found in the hollow interior of bones. Blood cells are suppose to be produced from bone marrow.Bone marrow makes your blood cells, but it isn't considered an organ.nswer by Pluto8888. Confidence votes 204. Red blood cell's organ system is Circulatory. Red blood cells are produced by bone marrow, which is not an organ, but a tissue found in the hollow interior of bones. Blood cells are suppose to be produced from bone marrow.