Neuroscience Quiz

Which part of the neuron contains the nucleus and most of the organelles?

• Axon

• Dendrites

• Cell body

• Synaptic cleft

What is the primary ion found inside a neuron during its resting potential?

• Sodium (Na⁺)

• Potassium (K⁺)

• Calcium (Ca²⁺)

• Chloride (Cl⁻)

The point at which a neuron will fire an action potential is called the _______.

• Refractory period

• Resting potential

• Threshold

• Depolarization point

Which of the following best describes the function of the myelin sheath?

• It increases the speed of nerve impulse transmission

• It blocks neurotransmitter release

• It slows down the electrical impulses

• It allows ions to move freely across the axon membrane

During an action potential, what ion rapidly enters the neuron causing depolarization?

• Potassium (K⁺)

• Sodium (Na⁺)

• Calcium (Ca²⁺)

• Chloride (Cl⁻)

What is the role of neurotransmitters in the synapse?

• They block nerve impulses

• They transmit the signal across the synaptic cleft

• They cause hyperpolarization of the membrane

• They remove ions from the axon