Quiz on Nerve Impulse and Nerve Synapse

What is the nerve impulse?

• A signal from the heart

• A type of muscle contraction

• A message transmitted through nerves

• A chemical reaction in the brain

What is the electrical potential difference of a nerve cell at rest?

• -40 mV

• +40 mV

• -70 mV

• 0 mV

What ions are more concentrated outside the nerve cell at rest?

• Potassium ions (K+)

• Sodium ions (Na+)

• Chloride ions (Cl-)

• Calcium ions (Ca+)

What is the state of the nerve cell when it is at rest?

• Depolarized

• Repolarized

• Polarized

• Hyperpolarized

What happens during depolarization?

• Potassium ions flow into the cell

• Sodium ions flow out of the cell

• Sodium ions flow into the cell

• Chloride ions flow out of the cell

What is the membrane potential during depolarization?

• -70 mV

• +40 mV

• 0 mV

• -40 mV

What is the term for the nerve cell's response to a stimulus?

• Synaptic transmission

• Refractory period

• Resting potential

• Action potential

What occurs during the refractory period?

• The cell is highly responsive to stimuli

• The cell is actively transmitting impulses

• The cell cannot respond to any stimulus

• The cell is in a state of depolarization

What is the role of the sodium-potassium pump?

• To generate action potentials

• To increase membrane permeability

• To maintain ionic distribution

• To facilitate synaptic transmission

What happens after depolarization?

• The cell enters a refractory state

• The cell remains depolarized

• The cell dies

• The cell becomes repolarized