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Explain the roles of the satiety and feeding centers. Where are they located?
The feeding center causes an animal to eat, and the satiety center causes an animal to cease eating. Both centers are located in the hypothalamus.
Studies show that most obese humans have elevated leptin levels in their blood. Based on your understanding of endocrine disorders, propose some reason why leptin is not decreasing food intake in these people.
The problem might involve abnormal tissue responsiveness-a target cell with no leptin receptors or defective receptors. There might also be a problem with leptin's signal transduction/second messenger pathway.
Name seven factors that can influence a person's metabolic rate.
Age, sex, lean muscle mass, activity, diet, hormones, and genetics
Why does the body store most of its extra energy in fat and not in glycogen?
One gram of fat contains more than twice the energy of 1 gram of glycogen.
Complete and balance the following equation for aerobic metabolism of one glucose molecule:
C6H12O6 + O2 -> ? +?
C6H12O6 + 6O2 -> 6CO2 + 6H2O
What is the RQ for the balanced equation in Concept Check 5?
RQ = CO2/O2 = 6/6 = 1
Are GLUT transporters active or passive transporters?
Passive facilitated diffusion transporters
What is a dL?
deciliter or 100mL
Use your understanding of digestive physiology to predict the common side effects of taking bile acid sequestrants and ezetimibe.
Bile acid sequestrants and ezetimibe leave bile salts and cholesterol in the intestinal lumen to be excreted, so possible side effects are losse, fatty feces and inadequate absorption of fat-soluble vitamins.
What is the difference between glycogenesis and gluconeogenesis?
Glycogenesis is glycogen synthesis; sluconeogenesis is synthesis of slucose from amino acids or glycerol.
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