PBSI 235 Exam 1

Front

A drug’s site of action refers to:

Back

Where the drug binds in the body.

Front

What can result in IPSPs?

Back

Opening Cl⁻ or K⁺ channels.

Front

Which method of signal termination is the fastest?

Back

Enzymatic degradation.

Front

What occurs at the threshold of an action potential?

Back

Voltage-gated Na⁺ channels open rapidly.

Front

Which factor helps maintain the resting potential?

Back

Sodium-potassium pump.

Front

Define IPSP (Inhibitory Postsynaptic Potential).

Back

A change in the postsynaptic membrane potential that makes it less likely to generate an action potential.

Front

What is the role of the sodium-potassium pump?

Back

To maintain the resting membrane potential by moving Na⁺ out and K⁺ into the cell.

Front

Explain the concept of action potential.

Back

A rapid rise and fall in membrane potential that occurs when a neuron sends a signal.

Front

What is desensitization in the context of neurotransmitter signaling?

Back

A process where receptors become less responsive to a neurotransmitter after prolonged exposure.

Front

What is the function of voltage-gated channels?

Back

To open or close in response to changes in membrane potential, allowing ions to flow across the membrane.