Understanding Action Potentials and Synapses

What is the resting membrane potential of a neuron?

• -55mV

• -70mV

• 0mV

• +30mV

At what membrane potential is an action potential triggered in a neuron?

• -70mV

• -60mV

• -55mV

• -50mV

During which refractory period is it impossible to trigger a new action potential?

• Absolute refractory period

• Relative refractory period

• Resting period

• Depolarization period

What happens during exocytosis in a neuron?

• Neurotransmitters are absorbed into the neuron.

• Neurotransmitters are released into the synapse.

• Vesicles are formed.

• Calcium ions are released.

Which ion is crucial for the release of neurotransmitters into the synapse?

• Na+

• K+

• Ca2+

• Cl-

What is the role of Ca2+ in neurotransmitter release?

• It depolarizes the neuron.

• It triggers vesicles to release neurotransmitters.

• It inhibits action potential.

• It activates Na+ channels.

What is the membrane potential of a neuron at rest?

• -55mV

• -70mV

• +30mV

• 0mV

Which process involves the reformation of vesicles after neurotransmitter release?

• Exocytosis

• Endocytosis

• Depolarization

• Hyperpolarization

What is the threshold potential for triggering an action potential?

• -70mV

• -60mV

• -55mV

• -50mV

During which period can a stronger stimulus trigger an action potential?

• Absolute refractory period

• Relative refractory period

• Resting period

• Depolarization period