BIOLOGY 1A03 Quiz: Hunger and the Chemical Senses.docx

• School: McMaster University
• Department: Biology
• Course: BIOLOGY 1A03
• Professor: Rosada Silva

Document Summary

Introduction: food brings family and friends together, feeding gives you pleasure, during human evolutionary past, food sources were scarce and behaviours were motivated by the constant need to obtain energy and nutrients essential to survive. In present context, evolutionarily driven behaviours are out of place because calories come cheaply and easily: food doesn"t taste the same without sense of smell. Neuropeptide y: high levels of npy activity in the hypothalamus increased appetite and food seeking behaviours, affects feeding behaviour similarly in fish, reptiles, birds, and other non-human mammals. Satiety and the liver: high glucose levels and high glycogen levels and high glycogen stores are signals of satiety. The rats who received cck ate more total meals per day than the controls, and so the total daily food intake was actually the same for both groups: cck is a short term satiety signal. Long term energy storage: short term and long-term mechanisms interact to regulate overall energy balance and body-weight.