Membrane-05 Flashcards
1
Q
What do receptor proteins cause and why?
A
A change in membrane potential due to external sensory signals
2
Q
Where are receptor proteins located?
A
They are embedded in sensory cell membranes
3
Q
how does a change in membrane potential occur?
A
energy from the environment reacts with membrane proteins, causing depolarization
4
Q
what is the exception to a change in membrane potential and why?
A
Exception of photoreceptors, which hyperpolarize
4
Q
how do receptor proteins work?
A
They change shape when they receive specific energy which can directly open ion channels and depolarize or activate enzyme protein via G protein coupling, produce second messengers like cAMP and cGMP, and then amplify the signal
