Question

Question 38

An RER of 0.70 represents substrate utilization entirely of carbohydrate.

True

False

Question 39

Oxidation refers to the donation of electrons by a molecule, while reduction refers to the acceptance of electrons by a molecule.

True

False

Question 40

In negative feedback, the response of the system is ...

	A.	to increase the effectiveness of the stimulus
	B.	opposite that of the stimulus
	C.	to modify a receptor’s response to the stimulus
	D.	both A and C are correct
	E.	none of the above are correct

Question 41

During the citric acid cycle, oxygen is a vital component for ATP production.

True

False

Question 42

During lower intensity exercise, (25% VO2max) which of the following sources will provide most of the energy?

	A.	Muscle Glycogen
	B.	Plasma Glucose
	C.	Plasma Free-fatty Acids
	D.	Muscle Triglycerides
	E.	ATP-PC

Answer 1

The RER or respiratory exchange ratio is the ratio between the amount of CO2 produced in metabolism and O2 used.

An RER of 0.70 represents substrate utilization entirely of carbohydrate is False. Actually, RER of 0.70 indicates that fat is the predominant fuel source, RER of 0.85 suggests a mix of fats, carbohydrates and a value of 1.00 or above is indicative of carbohydrate being the predominant fuel source.

Oxidation refers to the donation of electrons by a molecule, while reduction refers to the acceptance of electrons by a molecule. True.

In negative feedback, the response of the system is opposite that of the stimulus.

During the citric acid cycle, oxygen is a vital component for ATP production. True

During lower intensity exercise, (25% VO2max) which of the ATP-PC will provide most of the energy i.e. of first 1-5sec of exercise.