topic 6 pt 3 ppt notes

What is the role of the axon hillock in a neuron?

• It generates action potentials.

• It stores neurotransmitters.

• It insulates the axon.

• It transports nutrients.

Which ion is primarily responsible for depolarization during an action potential?

• Sodium (Na+)

• Potassium (K+)

• Calcium (Ca2+)

• Chloride (Cl-)

What occurs during the repolarization phase of an action potential?

• Sodium channels open

• Potassium channels open

• Calcium channels open

• Chloride channels open

What is the term for the period when a neuron cannot fire another action potential?

• Absolute refractory period

• Relative refractory period

• Resting period

• Depolarization period

What is the primary way information is carried in neurons?

• Frequency of action potentials

• Amplitude of action potentials

• Duration of action potentials

• Shape of action potentials

What term is used to describe the frequency of action potentials?

• Firing rate

• Amplitude rate

• Duration rate

• Shape rate

What is the primary function of the axon in a neuron?

• To receive signals from other neurons

• To transmit signals away from the neuron

• To store neurotransmitters

• To protect the neuron

What is the role of Na⁺ channels during depolarization?

• Na⁺ channels open to allow Na⁺ to enter the cell.

• Na⁺ channels close to prevent Na⁺ from entering the cell.

• Na⁺ channels open to allow K⁺ to exit the cell.

• Na⁺ channels close to allow K⁺ to enter the cell.

During which phase are both Na⁺ and K⁺ channels closed?

• Resting potential

• Depolarization

• Repolarization

• Hyperpolarization

What is the role of the axon in action potential propagation?

• It transmits the action potential along its length.

• It generates the action potential.

• It inhibits the action potential.

• It stores the action potential.