The Nervous System

What is the primary function of the nervous system?

• To process and communicate information

• To control muscle movement only

• To support the digestive system

• To pump blood throughout the body

Which two main parts make up the central nervous system?

• Somatic and autonomic systems

• Liver and kidneys

• Brain and spinal cord

• Heart and lungs

What does the peripheral nervous system connect?

• Only the internal organs

• The brain to the spinal cord

• The CNS to the external environment

• Only the sensory organs

Which system controls voluntary movements?

• Autonomic nervous system

• Central nervous system

• Somatic nervous system

• Sympathetic nervous system

Which nervous system division controls involuntary actions?

• Peripheral nervous system

• Central nervous system

• Autonomic nervous system

• Somatic nervous system

What is the role of the sympathetic nervous system?

• To digest food

• To calm the body down

• To control voluntary movements

• To prepare the body for action

What type of cells insulate neurons in the CNS?

• Astrocytes

• Microglia

• Oligodendrocytes

• Schwann cells

What is myelination and why is it important?

• It's the transmission of signals, crucial for reflex actions

• It's the insulation of neuron axons, crucial for rapid signal transmission

• It's the division of the nervous system, crucial for processing information

• It's the process of digesting food, crucial for energy

What is the function of afferent neurons?

• To transmit signals to muscles

• To insulate neuron axons

• To receive and pass information to the CNS

• To support neuron function

What happens in a reflex action?

• The heart rate increases immediately

• The sensory neurons communicate directly with muscles

• The spinal cord directly controls the response

• The brain processes the information before responding