Nervous System Quiz

What are the three principal functions of the nervous system?

• Sensory input, integration, and motor output

• Balance, coordination, and flexibility

• Memory, attention, and perception

• Digestion, respiration, and circulation

Answer explanation

The three principal functions of the nervous system are sensory input, integration, and motor output. These functions allow the body to receive information from the environment, process it, and respond accordingly.

Which part of the nervous system is the main control center?

• Central nervous system

• Peripheral nervous system

• Somatic nervous system

• Autonomic nervous system

Answer explanation

The main control center of the nervous system is the Central nervous system, which includes the brain and spinal cord.

What is the function of the sensory division of the peripheral nervous system?

• Relaxes the body and calms it down

• Sends directions from the brain to muscles and glands

• Mobilizes the body into action

• Picks up sensory stimuli and sends them to the brain

Answer explanation

The sensory division of the peripheral nervous system picks up sensory stimuli and sends them to the brain.

Which glial cells anchor neurons to their blood supply?

• Oligodendrocytes

• Ependymal cells

• Microglial cells

• Astrocytes

Answer explanation

Astrocytes are glial cells that anchor neurons to their blood supply.

What is the main function of motor neurons?

• Wrap around axons and produce the myelin sheath

• Transmit impulses between sensory and motor neurons

• Send directions from the brain to muscles and glands

• Pick up sensory stimuli and send them to the brain

Answer explanation

Motor neurons send directions from the brain to muscles and glands.

Which type of neuron is found mostly in sensory receptors?

• Unipolar neurons

• Multipolar neurons

• Interneurons

• Bipolar neurons

Answer explanation

Unipolar neurons are mostly found in sensory receptors. They are specialized to transmit sensory information from the periphery to the central nervous system.

What is the role of interneurons?

• Pick up messages and transmit impulses from sensory receptors

• Transmit impulses away from the central nervous system

• Wrap around axons and produce the myelin sheath

• Transmit impulses between sensory and motor neurons

Answer explanation

Interneurons transmit impulses between sensory and motor neurons.

What happens when a spider crawls on your knee?

• Your sensory neurons transmit the signal to your brain

• Your motor neurons kick your leg out

• Your interneurons interpret the signal and trigger a response

• All of the above

Answer explanation

When a spider crawls on your knee, your sensory neurons transmit the signal to your brain, your motor neurons kick your leg out, and your interneurons interpret the signal and trigger a response. Therefore, all of the above choices are correct.

What is the metabolic rate of neurons?

• Lowest among all cells in the body

• Similar to skin cells

• High, requiring a steady supply of glucose and oxygen

• Moderate compared to other cells

Answer explanation

Neurons have a high metabolic rate, requiring a steady supply of glucose and oxygen.

What is the function of dendrites in a neuron?

• Transmit electrical impulses away from the cell body

• Pick up messages from other cells and convey information to the cell body

• Anchor neurons to their blood supply

• Wrap around axons and produce the myelin sheath

Answer explanation

Dendrites pick up messages from other cells and convey information to the cell body. They play a crucial role in receiving and transmitting signals within a neuron.