NUTRITN 130 Lecture Notes - Lecture 4: Mitochondrion, Amylase, Gut Flora
Document Summary
Appetite: a desire to eat that is stimulated by. Hunger: a physiological drive to eat that occurs when our body senses that we need. The hypothalamus region of the brain contains a cluster of nerve cells known as the feeding center and another cluster of cells known as the satiety center: Nerve cells in the stomach and small intestine sense food and send message to the hypothalamus. Foods (amount and type) have differing effects on our feelings of hunger and satiety. Carbs have a lower satiety value than fats. Bulky foods provide a sense of satiety. Solid foods are more filling than semisolid foods or liquids. Atoms bond to each other to form molecules. Molecules: groups of atoms bonded in specific configurations. Biomolecules in cells: carbs, proteins, lipids, nucleic acids. Long lipid tails face each other toward the interior of the membrane. Phosphate heads line the interior and exterior surfaces of the membrane.
