Which of the following statements regarding the release of insulin is correct?
A. Insulin is released by the pancreas at a constant rate throughout the day.
B. Release surges of insulin are responsive to a decrease in the blood glucose level.
C. Release surges of insulin can be observed after meals.
D. Insulin is released by the pancreases only after a meal.
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Glucose molecules from the blood are transported into the cells by____________.
A. active transport
B. passive diffusion
C. facilitated diffusion
Insulin helps glucose to enter the cells by__________.
A. binding to insulin receptors and activating glucose transporters
B. directly creating pores on the cell membrane
C. increasing the concentration gradient of glucose across cell membrane.
D. decreasing the concentration gradient of glucose across cell membrane.
When cells are starved for glucose, they begin to use__________ as their energy source.
A. proteins
B. fats
C. nucleic acids
D. hormones
Which of the following statements regarding ketones is NOT TRUE?
A. They are metabolites of fats.
B. They are produced by the liver.
C. They can poison and kill cells when they accumulate in the body.
D. They are more efficient energy source than glucose.
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