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.
Summary Information: Spleen. Spleen: The spleen is an organ of the lymphatic system and immune system. It is the largest of the lymph organs and is located in the upper left abdominal area. It is made of lymphatic tissue that produces lymphocytes and also houses macrophages.pleen: The spleen is an organ of the lymphatic system and immune system. It is the largest of the lymph organs and is located in the upper left abdominal area.