Sodium-Potassium Pump and Neuron Function

Neurons transmit information using electrical impulses, facilitated by voltage-gated ion channels. These channels respond to changes in membrane potential, crucial for generating action potentials. The sodium-potassium pump maintains ion gradients, essential for neuronal signaling, using ATP to move ions against their concentration gradients. This process involves complex molecular interactions and is vital for the neuron's ability to send signals.

What is the primary function of neurons in the nervous system?

• To digest nutrients

• To produce hormones

• To transmit electrical impulses

• To store energy

What happens to the membrane potential when a neuron is at rest?

• It remains polarized

• It becomes depolarized

• It becomes hyperpolarized

• It becomes neutral

Which ion enters the neuron during the depolarization phase of an action potential?

• Chloride

• Sodium

• Calcium

• Potassium

How do potassium channels contribute to repolarization?

• By opening calcium channels

• By closing sodium channels

• By allowing sodium to enter

• By allowing potassium to exit

What is the role of the sodium-potassium pump after an action potential?

• To generate action potentials

• To depolarize the membrane

• To inhibit neurotransmitter release

• To restore ion gradients

How many sodium ions are moved out of the cell by the sodium-potassium pump in each cycle?

• Four

• Three

• Two

• One

What is the energy source for the sodium-potassium pump?

• Glucose

• ATP

• GTP

• NADH

Which domains form the core engine of the sodium-potassium pump?

• A, B, C

• M, N, O

• X, Y, Z

• A, P, N

What happens to the sodium-potassium pump when ATP binds to it?

• The extracellular gate opens

• The intracellular gate opens

• The pump becomes inactive

• The pump releases calcium ions

Approximately what fraction of daily ATP production is used to power the sodium-potassium pump?

• Two thirds

• One half

• One third

• One tenth