Q: Which of the following equations best represents the Nernst equation, which can be used to calculate the equilibrium potential for an ion across a membrane?

$$E = \frac{RT}{zF} \ln \left( \frac{[\text{ion}]_{\text{outside}}}{[\text{ion}]_{\text{inside}}} \right)$$

Question 1

The image above depicts a chemical synapse. Which of the following best describes the sequence of events that occur at this synapse when an action potential arrives at the presynaptic terminal?

Accepted Answer

An action potential causes voltage-gated calcium channels to open, calcium enters the presynaptic terminal, triggering vesicles to release neurotransmitters into the synaptic cleft, which then bind to receptors on the postsynaptic membrane.

Question 2

Which structure in the image is responsible for storing and releasing neurotransmitters?

Accepted Answer

The synaptic vesicles

Question 3

What is the primary function of the receptors on the postsynaptic membrane (right side of the image)?

Accepted Answer

To bind neurotransmitters and initiate a response in the postsynaptic cell

Question 4

Which ion is most directly responsible for triggering the release of neurotransmitters from the presynaptic terminal?

Accepted Answer

Calcium (Ca\^{2+})

Question 5

If a drug blocks the receptors shown on the postsynaptic membrane, what would be the most likely effect?

Accepted Answer

Decreased response in the postsynaptic cell

Question 6

Which of the following best describes the direction of information flow at a chemical synapse as shown in the image?

Accepted Answer

From the presynaptic cell to the postsynaptic cell

Question 7

Which process is responsible for removing neurotransmitters from the synaptic cleft after they have bound to receptors?

Accepted Answer

Enzymatic degradation, reuptake into the presynaptic cell, or diffusion away from the synaptic cleft

Question 8

Suppose a mutation prevents the opening of voltage-gated calcium channels in the presynaptic terminal. What would be the most immediate effect on synaptic transmission?

Accepted Answer

Neurotransmitter release would be greatly reduced or absent

Question 9

Which of the following best explains why chemical synapses allow for more complex signaling than electrical synapses?

Accepted Answer

Chemical synapses use neurotransmitters, allowing for integration, modulation, and plasticity of signals

Question 10

Which of the following equations best represents the Nernst equation, which can be used to calculate the equilibrium potential for an ion across a membrane?

Accepted Answer

$$E = \frac{RT}{zF} \ln \left( \frac{[	ext{ion}]_{	ext{outside}}}{[	ext{ion}]_{	ext{inside}}} ight)$$

Anatomy & Physiology: Nervous System Study Guide (Ch 8)

Guida di studio - Domande di pratica

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