3.4 Physiology of the GI Tract Part 3 Flashcards
What is satiety?
feeling of being full
What is hunger?
internal drive to find and eat food perceived as a negative sensation
What is the hypothalamus?
region of the brain that plays a role in hunger and satiety
What stimulates the feeding center of the hypothalamus?
drop in nutrients in the blood
What stimulates the satiety center of the hypothalamus?
rise in nutrients in the blood
What portion of the GI tract plays a role in satiety and weight regulation?
stomach
How does the stomach play a role in satiety and weight regulation?
as the stomach expands receptors in the wall send a signal to the hypothalamus
What are hormones?
compounds that are secreted into the bloodstream by one type of cell that work to control the function of another type of cell
What are the hormones that increase hunger?
ghrelin
endorphins
neuropeptide Y
What are the hormones that decrease hunger?
leptin
serotonin
CCK
Where is leptin produced?
adipose cells
What is the role of leptin?
turn off the hunger center
Where is ghrelin produced?
stomach
What is the role of ghrelin?
turn on the hunger center
What are the three biochemical categories that the body needs in large amounts?
carbohydrates
proteins
lipids
