Nervous System Quiz

What is the primary function of the central nervous system?

• To carry information to the peripheral nervous system

• To make up the brain and spinal cord

• To insulate, support, and protect neurons

• To control involuntary responses

Which division of the peripheral nervous system is responsible for carrying information from the central nervous system?

• Sensory (afferent) division

• Motor (efferent) division

• Autonomic division

• Somatic division

What is the role of Schwann cells in the nervous system?

• They are nerve cells

• They are gaps along the axon

• They wrap around axons and produce myelin

• They are the metabolic center of a neuron

What is the function of myelin?

• To conduct impulses away from the cell body

• To increase the rate of transmission along neurons

• To receive and convey messages to the cell body of a neuron

• To respond to nerve impulses by releasing neurotransmitters

What describes the function of a synapse in the nervous system?

• Metabolic center of a neuron

• Gap along the axon covered by myelin sheath

• Space between an axon terminal and the membrane of the next cell

• Bundle of myelinated axons in the brain and spinal cord

Which type of neuron carries impulses from receptors to the CNS?

• Motor neuron

• Sensory neuron

• Interneuron

• Proprioceptor

What describes the 'all-or-none response' in neural activity?

• A neuron's response varies with stimulus strength.

• An action potential either occurs fully or not at all.

• Only specific neurons can generate an action potential.

• An action potential happens with slight depolarization.

What occurs during the depolarization phase of an action potential?

• Sodium ions rush into the cell, changing the membrane polarity.

• Potassium ions diffuse out of the neuron.

• The neuron becomes impermeable to all ions.

• ATP is used to pump sodium ions out of the cell.

What is the role of the sodium-potassium pump in a neuron?

• It detects stretch in muscles.

• It connects sensory and motor neurons.

• It restores the resting potential by moving Na+ and K+ ions.

• It generates impulses in response to sensory input.

What are neurotransmitters responsible for in the nervous system?

• Transmitting nerve impulses across synapses

• Controlling heart rate and blood pressure

• Processing visual information

• Regulating body temperature