Most of the glucose secreted by the liver during fasting is due to
A. glycogenolysis.
B. gluconeogenesis.
C. lipolysis.
D. deamination
57.Fatty acids are NOT an energy source for
A. the brain.
B. resting skeletal muscle.
C. the liver.
D. the heart.
is it the brain ?
What type of tissue is especially dependent on adequate plasma glucose levels?
A. skeletal muscle
B. cardiac muscle
C. nervous
D. liver
When you have answered these, one of the teachers will be happy to comment on your answers.
And that was ur response ????
a
d
d
add
the last one is nervous not liver.
To answer the question "Most of the glucose secreted by the liver during fasting is due to," we can go through each answer choice and explain how to determine the correct option:
A. Glycogenolysis: This process involves the breakdown of glycogen stored in the liver to release glucose. During fasting, glycogen reserves are depleted, and the liver starts using other mechanisms to produce glucose.
B. Gluconeogenesis: This is the process of creating new glucose from non-carbohydrate sources, such as amino acids and glycerol. Gluconeogenesis is the primary mechanism by which the liver generates glucose during fasting.
C. Lipolysis: Lipolysis refers to the breakdown of fats to release fatty acids and glycerol. While lipolysis does provide an alternative energy source during fasting, it does not directly contribute to glucose production.
D. Deamination: Deamination involves the removal of an amino group from an amino acid. It is not directly involved in glucose production during fasting.
Based on these explanations, the correct answer is B. Gluconeogenesis, as it is the primary mechanism for glucose production by the liver during fasting.
For the question "Fatty acids are NOT an energy source for," we can go through each answer choice and explain how to determine the correct option:
A. The brain: While glucose is the primary fuel for the brain, during periods of prolonged fasting or starvation, the brain can adapt to using ketone bodies derived from fatty acids as an alternative energy source. So, fatty acids can still be used by the brain for energy under certain conditions.
B. Resting skeletal muscle: Fatty acids are a significant energy source for resting skeletal muscle. In this state, fatty acids are oxidized to meet the energy demands of the muscle.
C. The liver: The liver can utilize fatty acids as an energy source as well. It is involved in lipid metabolism, including the breakdown of fatty acids for energy production.
D. The heart: The heart primarily utilizes fatty acids as its energy source. The heart has a high capacity for fatty acid oxidation, which provides a continuous energy supply to the cardiac muscle.
Based on these explanations, the correct answer is A. The brain. Although glucose is the brain's preferred fuel, fatty acids can still be used as an energy source under specific conditions.
Regarding the question "What type of tissue is especially dependent on adequate plasma glucose levels?" we can go through each answer choice and explain how to determine the correct option:
A. Skeletal muscle: While skeletal muscle can utilize glucose as an energy source, it has the ability to switch to fatty acid metabolism during fasting or prolonged exercise. Therefore, it is not solely dependent on glucose levels.
B. Cardiac muscle: The cardiac muscle primarily relies on fatty acids as its energy source. However, it can also use glucose when available.
C. Nervous tissue: The brain and nervous tissue are highly dependent on glucose as their primary energy source. These tissues have limited ability to use alternative fuel sources like fatty acids.
D. Liver: The liver is involved in maintaining glucose levels during fasting and plays a role in regulating overall glucose homeostasis. However, it is not specifically dependent on plasma glucose levels.
Based on these explanations, the correct answer is C. Nervous tissue, as it is especially dependent on adequate plasma glucose levels for energy production.