Which organ has the greatest proportion of basal metabolic rate? a. Heart b. Bra

Question

Which organ has the greatest proportion of basal metabolic rate? a. Heart b. Brain c. liver d. intestines "Hitting the wall" (Bonking) during exercise is a result of... a. Needing more oxygen b. Running out of ATP c. Running out of glucose/glycogen d. Lactic acid buildup The main metabolic fuel (for all tissues except nerves) of the post-absorptive state is(are a. Glucose b. Fatty acids c. Oxygen d. Amino acids Lactate is rebuilt into glucose/glycogen in the liver as one half of ___. a. Glycolysis b. Beta oxidation c. The Cori Cycle d. None of these

Explanation / Answer

1) Brain has highest basal metabolic rate at rest a number of functions are carried out by brain at rest like breathing, circulation of blood,body temperature, brain and nerve function cell growth and muscle contraction basal metabolic rate depends on energy used by organ at rest and not by size.

2) Bonking is result of running out of glucose/glycogen bonking is sudden condition of fatigue caused by depletion of glucose/glycogen the condition can be avoided by taking appropriate glucose diets and drinks.

3)Nerves rely mainly on glucose for its functions glucose is used mainly for synaptic action and and resting potential in brain.

4)Lactate is transported back to liver where it is converted to glucose by lactate dehydrogenase enzyme through cori cycle leading to formation of glucose through gluconeogeic pathway.

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