Question

question 13
is a neurotransmitter with roles in pleasure and pain modulation.
beta - endorphin
acetylcholine
norepinephrine
gaba

the
is the difference in charge between the intracellular and extracellular space of a neuron.
membrane potential
resting potential
extracellular fluid
intracellular fluid

Explanation:

Beta - endorphin is a neurotransmitter involved in pleasure and pain modulation. It acts as a natural painkiller and can produce feelings of euphoria. The membrane potential is the difference in charge between the intracellular and extracellular space of a neuron. Resting potential is a type of membrane potential when a neuron is not actively sending a signal, and intracellular/extracellular fluid are the environments inside and outside the neuron respectively.

Answer:

Question 13: D. beta - endorphin
The other question: D. membrane potential