Draco eats only half a slice of pizza, but he gets full very quickly. Which of the following would NOT be able to explain this odd feeding behaviour?单项选择题

A

A) Draco's small intestine started to produce CCK while he was eating, which sends a signal to the CCK receptors in the brain to stop eating.

B

B) Draco has eaten recently, so his glucose and glycogen levels are still high; in the liver this acts as a satiety signal, which is then sent to the brain.

C

C) Draco's adipose tissue secrete leptin, acting on receptors in the brain and reducing his appetite and food consumption.

D

D) Draco has increased NPY activity in his hypothalamus after eating, which causes his food-seeking behaviours to be reduced.

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This is a schematic of the neurons that form the antagonistic pair in the arcuate nucleus, a region that has a fenestrated blood-brain barrier that allows signaling by hormones from the periphery. I have put in labels for 4 key hormones and 3 key receptors that are involved in this neuronal pathway that are responsible for stimulating appetite and, in part, regulating satiety. Your task is to look up the following hormones: Leptin Agouti-related protein (AgRP) Insulin Ghrelin Then answer the questions below. 1: What is the effect of hormone 1 on AgRP/NPY neurons ____ 2: What is the effect of hormone 2 on POMC neurons ____ 3: What is the effect of hormone 2 on AgRP/NPY neurons ____ 4: What is the effect of hormone 3 on PVN neurons? ____ 5: What is the effect of hormone 1 on POMC neurons ____ 6: What is the effect of hormone 4 on PVN neurons? ____

This is a schematic of the neurons that form the antagonistic pair in the arcuate nucleus, a region that has a fenestrated blood-brain barrier that allows signaling by hormones from the periphery. I have put in labels for 4 key hormones and 3 key receptors that are involved in this neuronal pathway that are responsible for stimulating appetite and, in part, regulating satiety. Your task is to look up the following hormones: Leptin Agouti-related protein (AgRP) Insulin Ghrelin Then answer the questions below. 1: In the figure what is the identity of receptor 2 (R2)? ____ 2: In the figure what is the identity of receptor 1 (R1)? ____ 3: In the figure what is the identity of receptor 3 (R3)? ____

This is a schematic of the neurons that form the antagonistic pair in the arcuate nucleus, a region that has a fenestrated blood-brain barrier that allows signaling by hormones from the periphery. I have put in labels for 4 key hormones and 3 key receptors that are involved in this neuronal pathway that are responsible for stimulating appetite and, in part, regulating satiety. Your task is to look up the following hormones: Leptin Agouti-related protein (AgRP) Insulin Ghrelin Then answer the questions below. 1: In the figure what is the identity of receptor 1 (R1)? ____ 2: In the figure what is the identity of receptor 3 (R3)? ____ 3: In the figure what is the identity of receptor 2 (R2)? ____

Which of the following best describes the relation between leptin and NPY in regulating food intake?

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