Question

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

Question 45

A half-marathoner expends 1600 kcals of energy over the course of 13 miles. Assuming that the half-marathon was run at an RQ of 0.85. Secondly, if the body fat stores in the individual were 8kg what is the net amount of fat left in adipose tissue depots at the end of the event?

	A.	7.912 kg
	B.	6.0 kg
	C.	6.5 kg
	D.	6.5 kg

Answer 1

Please find the answers below:

Answer 1: True (in a redox reaction, loss of electrons causes oxidation whereas gain of electrons causes reduction of the compounds)

Answer 2: Choice B (In negative feedback loop inhibition system, the effector organ/tissue/cell exerts an effect which prevents further action of the stimulus thus preventing the effect of stimulus)

Answer 3: False (redox reactions are the main causative agents in the citric acid cycle to generate ATP, the utilizity of oxygen to generate ATP remains dedicated to electron transport chain)

Answer 4: Choice E (Creatine metabolism remains the primary source of energy when the total energy content of the body is too low since this process is not completely reliable on oxygen)