Question

Question 1

When a person is in a fasted state, they feel hungry and this may be regulated by a hormone called ghrelin which is present in high quantities during a fasted state. When they are fed, ghrelin levels drop and the subjective feeling of hunger goes away. This is an example of a ...

	A.	Negative feedback loop
	B.	Positive feedback loop
	C.	Unilateral feedback loop
	D.	None of the above

Question 2

Enzymes basically work by...

	A.	Directly providing ATP for muscle contraction
	B.	Lowering the activation energy required to drive the reaction
	C.	Combining with NAD+ to provide energy
	D.	Helping oxygen attach to substrate during metabolism
	E.	Both A and B

Anaerobic glycolysis yields a net gain of...

		5 ATP
		10 ATP
		8 ATP
		2 ATP

After a few minutes of easy jogging at a submaximal intensity, my oxygen consumption and heart rate reach a plateau and stay at that level for 20 to 30 minutes as I am jogging. With regards to oxygen consumption this would be an example of ...

	A.	intermittent exercise
	B.	an oxygen deficit
	C.	incremental exercise
	D.	a steady state
	E.	homeostasis

After a few minutes of easy jogging at a submaximal intensity, my oxygen consumption and heart rate reach a plateau and stay at that level for 20 to 30 minutes as I am jogging. With regards to oxygen consumption this would be an example of ...

	A.	intermittent exercise
	B.	an oxygen deficit
	C.	incremental exercise
	D.	a steady state
	E.	homeostasis

Answer 1

Answer B: Positive feed back loop

Explanation: The two hormones leptin and ghrelin regulate energy balance through appetite. The former facilitates energy levels by decreasing appetite and shows negative feedback. However, when body needs energy, it produces ghrelin which shows positive feedback and is used as a principal trigger to find out energy-rich nutrition.