ESS 3 Lecture Notes - Lecture 5: Gallbladder, Glycogen, Blood Sugar
3 Nov 2016
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Document Summary
Hunger: the physiologic drive for food that occurs when our body senses that we need to eat, a variety of foods could satisfy you. Appetite: a psychological desire to consume specific foods. The brain produces the sensation of hunger. This prompt to eat is given by the hypothalamus in the brain. The nerve cells lining the stomach and small intestine detect changes in pressure according to whether the organ is empty or full. Hormones are chemical messengers that are secreted into the bloodstream. Insulin and glycogen are two hormones responsible for maintaining blood glucose levels. The body is organized from the smallest functional units to functional systems. Our body is made up of atoms. Atoms are the smallest units of matter. Cells are the smallest units of life. Cells of a single type join together to form tissues. Several types of tissues join together to form organs. Mechanical digestion: physical breakdown of food.
