Nervous System Introduction and Organization

What are the three principal functions of the nervous system?

• Memory, Learning, and Emotions

• Sensory input, Integration, and Motor output

• Digestion, Respiration, and Circulation

• Vision, Hearing, and Smell

Which part of the nervous system is composed of the brain and spinal cord?

• Central nervous system

• Autonomic nervous system

• Peripheral nervous system

• Somatic nervous system

What is the main function of astrocytes in the central nervous system?

• Act as the main source of immune defense

• Produce and circulate cerebrospinal fluid

• Wrap around neurons, producing an insulating barrier

• Anchor neurons to their blood supply and govern the exchange of materials

Which type of neurons are mostly found in sensory receptors?

• Motor neurons

• Multipolar neurons

• Bipolar neurons

• Unipolar neurons

What is the main function of efferent neurons?

• Pick up messages and transmit impulses from sensory receptors

• Transmit impulses away from the central nervous system to muscles and glands

• Transmit impulses between sensory and motor neurons

• Anchor neurons to their blood supply and govern the exchange of materials

What is the main function of interneurons?

• Transmit impulses between sensory and motor neurons

• Live in the central nervous system and transmit impulses between sensory and motor neurons

• Transmit impulses away from the central nervous system to muscles and glands

• Pick up messages and transmit impulses from sensory receptors

What is the main function of dendrites in a neuron?

• Wrap around neurons, producing an insulating barrier

• Anchor neurons to their blood supply and govern the exchange of materials

• Pick up messages and convey information to the cell body

• Transmit electrical impulses away from the cell body to other cells

What is the main function of the axon in a neuron?

• Anchor neurons to their blood supply and govern the exchange of materials

• Produce and circulate cerebrospinal fluid

• Transmit electrical impulses away from the cell body to other cells

• Pick up messages and convey information to the cell body

What is the main function of microglial cells in the central nervous system?

• Wrap around neurons, producing an insulating barrier

• Act as the main source of immune defense

• Produce and circulate cerebrospinal fluid

• Anchor neurons to their blood supply and govern the exchange of materials

What is the main function of Schwann cells in the peripheral nervous system?

• Act as the main source of immune defense

• Wrap around axons and make the insulating myelin sheath

• Produce and circulate cerebrospinal fluid

• Anchor neurons to their blood supply and govern the exchange of materials