Worksheetschapter 11 hunger
Total questions: 22
Worksheet time: 22mins
why we need food
building blocks and fuel
carbohydrates
amino acids
vitamins, and minerals
Body needs to store nutrients for use when animal is not filing stomach:
need regulation for food storage
short term( carbs)
long term( fat like a hibernating bear)
need to balance body wight, metabolism, food availability and nutrition
blood chemical control of eating
glucose, insulin, and glucagon levels
more digested food enters the bloodstream as glucose
glucose is often used for the body and nearly only fuel for the brain
when glucose levels are high
liver cells convert some of the excess into glycogen
fat cells convert glucose to fat
liver cells convert some of the excess into fat
fat cells convert glucose to glycogen
when glucose levels are low
liver converts glycogen back into glucose
glucose converts glycogen back into liver
glycogen converts glycogen back into glucose
glycogen converts liver back into glucose
when do insulin levels rise
someone is getting ready for a meal
after indigestion
after a meal
without eating
high levels of insulin generated during a meal
generally decrease an appetite
generally increase an appetite
no change
a big change
stomach mechanism 1 of eating
distension is sensed by stretch receptors
sent as a signal to brain by vagus nerve
satiety
release of cck
stomach control of eating mechanism 2
release of CCK(cholocyotokesin)
close muscle between stomach and duodenum
reduces gastric emptying
stomach distends faster
stomach control of eating mechanism 3
gherlin secretion
stimulates hunger
gherlin levels increase before meal
no gherlin secretion
constant high levels of gherlin =
nothing
prade willis syndrome
(constant eating)
obesity
something
gherlin from the stomach and digestive tract signals the _____ and stimulates ___/___
thamlus,
hunger/feeding
hypothalamus, hunger/feeding
vagus nerve,
hunger/satiety
medulla
hunger/thirst
what starts a meal
privation
glucoprivation
listoprivation
lipoprivation
glucoprivation
dramatic fall in level of glucose available to cells
dramatic fall in level of fatty acids available to cells
dramatic fall in level of acids available to cells
dramatic fall in level of fat available to cells
lipoprivation
dramatic fall in level of blood available to cells
dramatic fall in level of fatty acids available to cells
dramatic fall in level of oxygen available to cells
dramatic fall in level of glucose available to cells
the brain only uses _____and the rest of the body uses _____and____
glucose,
glucose and glucose
glucose,
glucose and fatty acids
fatty acids
glucose and fatty acids
oxygen
glucose and fatty acids
the liver has _____that sense decreased glucose and send messages to the brain via the ______
sensory neurons, vagus nerve
vagus nerve, sensory nerves
sensory neurons, thalamus
sensory neurons, medulla
receptors for glucose and lipids are located in the ____and convey signals about gluco- and liprovation to the brain through the ___
liver, lungs
liver, vagus nerve
liver, medulla
medulla, liver
the leptin effect
more leptin=fat
low leptin levels =more hunger
hormone secreted from adipose tissue
may be involved in long term satiety
the lateral thalamus (LH) regulates_____while the arcuate nucleus controls how ____
satiety, the LH responds
thirst, the LH responds
hunger, the LH response
sleep, the LH response
the feeding circuits in the brain
periaquaductal grey mater
locus corelius
lateral hypthamus (LH)
reticular formation
ventromedial hypthalmaus (VH)
NPY neurons
excited NPY=hunger
inhibited NPY and excited CARS=satiety
found in the arcuate nucleus
found in ventrolateral hyothalamus and sometimes in liver and medulla
