ANP: NERVOUS SYSTEMS

The basic functional unit of the nervous system is:

• Neuroglia

• Neuron

• Axon

• Synapse

Which part of the neuron receives incoming signals?

• Axon

• Myelin sheath

• Dendrites

What is the function of the axon?

• To receive impulses from other neurons

• To synthesize neurotransmitters

• To conduct impulses away from the cell body

The myelin sheath is mainly responsible for:

• Slowing down nerve impulses

• Providing nutrients to the neuron

• Speeding up nerve impulse transmission

• Storing neurotransmitters

During depolarization, which ion moves into the neuron?

• Potassium (K⁺)

• Sodium (Na⁺)

• Calcium (Ca²⁺)

• Chloride (Cl⁻)

The refractory period is when:

• The refractory period is when the Na+ and K+ are returned to their original sides

• The neuron is at resting potential

• The neuron is firing multiple action potentials at once

• The neuron is releasing neurotransmitters

The junction between two neurons is called a:

• Axon terminal

• Synapse

• Dendritic spine

What happens when an action potential reaches the synaptic terminal?

• Potassium ions flood into the neuron

• Calcium channels open, triggering neurotransmitter release

• Sodium channels close immediately

• The neuron enters the refractory period

Which neurotransmitter is primarily involved in muscle movement?

• Dopamine

• Serotonin

• Acetylcholine

• GABA

The central nervous system consists of:

• Brain and spinal cord

• Brain and peripheral nerves

• Spinal cord and ganglia

• Sensory and motor neurons