Neuroscience Quiz

What is the role of neurotransmitters in the passage of a nerve impulse?

• They transmit signals across the synaptic cleft.

• They generate action potentials in neurons.

• They insulate axons to speed up transmission.

• They provide energy for synaptic transmission.

Which part of the neuron releases neurotransmitters into the synaptic cleft?

• Vesicles

• Receptors

• Axons

• Dendrites

What is the function of receptors in synaptic transmission?

• They receive neurotransmitters and initiate a response.

• They store neurotransmitters for later use.

• They generate electrical impulses in the axon.

• They insulate the synaptic cleft.

What is the difference between presynaptic and postsynaptic neurons?

• Presynaptic neurons send signals; postsynaptic neurons receive them.

• Presynaptic neurons receive signals; postsynaptic neurons send them.

• Both presynaptic and postsynaptic neurons send signals.

• Both presynaptic and postsynaptic neurons receive signals.

What can cause a nerve impulse?

• A pinch

• A sound

• A smell

• A taste

How is a nerve impulse initiated in the neuron?

• By opening ion channels in the dendrites

• By closing ion channels in the axon

• By increasing the temperature of the neuron

• By decreasing the pressure inside the neuron

Which ions move across the membrane to initiate a nerve impulse?

• Sodium (Na⁺) and Potassium (K⁺)

• Calcium (Ca²⁺) and Chloride (Cl⁻)

• Magnesium (Mg²⁺) and Sulfate (SO₄²⁻)

• Hydrogen (H⁺) and Hydroxide (OH⁻)

What does it mean when the cell membrane of an axon is polarized?

• There is no charge difference between the inside and outside of the cell.

• One side is positive and the other is negative.

• Both sides are positive, but one is more positive than the other.

• Both sides are negative, but one is more negative than the other.

What is the ratio of sodium (Na) ions pumped out of the cell to potassium (K) ions pumped into the cell during the resting potential?

• 2 Na out for every 3 K in

• 3 Na out for every 2 K in

• 1 Na out for every 1 K in

• 4 Na out for every 2 K in

What is the charge distribution in an axon at rest?

• Slightly positive inside, very positive outside

• Very positive inside, slightly positive outside

• Neutral inside, negative outside

• Negative inside, neutral outside