If it happens that a neurotransmitter binds to a receptor site and produces a negative voltage shift, the probability:
that the neurons are densely connected decreases.
of an excitatory response increases.
that the receiving neuron will fire decreases.
that the transmitting neuron will fire increases.
I have no idea!
Resting potential = -70 mV; if this is increased, the receiving neuron is less likely to fire.
Cassandra's brain may never generate new stem cells because she:
A. smokes.
B. drinks.
C. is obese.
D. eats fatty food.
No problem! Understanding the relationship between neurotransmitters, receptor sites, and the effects on neuronal activity can be complex. Let's break it down step by step to find the correct answer:
1. Neurotransmitters: These are chemical messengers in the brain that transmit signals between neurons. They can have either excitatory or inhibitory effects on the receiving neuron.
2. Receptor sites: These are specific locations on the surface of the receiving neuron where neurotransmitters bind. Different neurotransmitters bind to specific receptor sites, like a key fitting into a lock.
3. Negative voltage shift: If a neurotransmitter binds to a receptor site and produces a negative voltage shift, it means that the receiving neuron becomes more negative or hyperpolarized. This inhibits the neuron's ability to generate an action potential and decreases the probability of firing.
Now, let's apply this information to each option and find the correct answer:
- "That the neurons are densely connected decreases": The binding of a neurotransmitter to a receptor site does not directly affect the connectivity of neurons, so this option is not related.
- "Of an excitatory response increases": Since the negative voltage shift inhibits the receiving neuron's ability to fire, it contradicts the possibility of an excitatory response. So this option is not correct.
- "That the receiving neuron will fire decreases": As mentioned earlier, a negative voltage shift inhibits the firing of the receiving neuron. Therefore, this option is correct.
- "That the transmitting neuron will fire increases": The question is about the effect on the receiving neuron, so the transmitting neuron's firing is not relevant to this scenario. This option is not correct.
Based on this explanation, the correct answer is: "That the receiving neuron will fire decreases."