Comparing signal and smell

Question 1

signal sensed

Answer 1

light (photoreception) vs chemical (chemoreception)

Question 2

GPCR involved

Answer 2

Rhodopsin and opsin (vision) vs odourant receptor (smell)

Question 3

G-protein involved

Answer 3

transduction vs Golf

Question 4

secondary messenger

Answer 4

cGMP levels decrease (vision) vs cAMP levels increase (smell)

Question 5

Messengers to brain

Answer 5

Message passed to Retinal Ganglion Neurons which form part of the optic nerve.
Optic nerve sends signal to visual cortex in the brain via thalamus

vs

Nerve cells signal directly to olfactory bulb. Signal then takes two paths, including a direct one to memory/emotional centres of the brain.