Neurophysiology Quiz

What type of signal is transmitted along the axon of a neuron?

• Chemical signal

• Electrical signal

• Thermal signal

• Magnetic signal

Which type of ion channel is always open?

• Mechanically gated channels

• Voltage-gated channels

• Leakage channels

• Chemical (Ligand) gated channels

What triggers the opening or closing of chemical (ligand) gated channels?

• Change in temperature

• Binding of a ligand

• Mechanical deformation

• Change in light intensity

What is the state of Na⁺ channel activation gates at rest?

• Open

• Closed

• Partially open

• Inactivated

How long after the activation gate opens does the Na⁺ channel inactivation gate block the channel?

• ~1ms

• ~5ms

• ~10ms

• ~15ms

How many voltage-sensitive gates do K⁺ channels have?

• Two

• Three

• One

• Four

What is the resting membrane potential of a neuron?

• ~70 mV

• ~50 mV

• ~90 mV

• ~30 mV

What maintains the resting membrane potential in neurons?

• Na+/K+ pump

• Ca2+ pump

• Cl- pump

• Mg2+ pump

Which type of potential involves long-distance signals on axons only?

• Action potentials

• Graded potentials

• Resting potentials

• Local potentials

Tags

NGSS.HS-PS3-5

What happens during depolarization of a neuron membrane?

• Inside becomes less negative

• Inside becomes more negative

• Probability of producing AP decreases

• Membrane potential remains unchanged