PSYC 2012 Lecture Notes - Lecture 30: Orexin, Cholecystokinin, Endocrine System
Document Summary
Goal: to understand the psychobiological bases of hunger and sleep. All living organisms need energy - atp is the energy currency of the cell. The energy to form atp comes from different sources: Obtaining energy from food depends on 3 processes: Digestion - the breakdown of food starting in the mouth and ending in the small intestine. Whe(cid:374) (cid:449)e eat so(cid:373)ethi(cid:374)g, the (cid:374)utrie(cid:374)ts are(cid:374)"t prese(cid:374)t i(cid:374) i(cid:374)di(cid:448)idual molecules - they are often linked in long chains. We need to break down the long chain of sugars (macromolecule) Absorption - the process of moving nutrients into the bloodstream from the gut. Special transport molecules on the surface of the cell move the molecules across the cell into the body where they can be delivered via the bloodstream to any part of the living system. Uptake - the process by which cells of the body take up nutrients for use in producing. Key point: the hypothalamus regulates hunger and satiety.
