Introduction to Nervous system

What is the primary function of the Central Nervous System (CNS)?

• Digesting food and regulating heart rate.

• Sending signals to the peripheral nerves for voluntary movements.

• Receiving signals from the body and sending commands to react.

• Protecting the brain and spinal cord with bones.

What structures naturally protect the brain and spinal cord?

• Cerebrospinal fluid and nerves.

• The skull and vertebrae.

• The Peripheral Nervous System.

• Muscles and skin.

Which part of the nervous system is responsible for actions like breathing and heart beating without conscious thought?

• The Somatic Nervous System.

• The Peripheral Nervous System.

• The Central Nervous System.

• The Vegetative or Involuntary Nervous System.

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Why does scratching an itch provide temporary relief?

• It physically removes the irritant from the skin.

• It increases blood flow to the itchy area, numbing the nerves.

• The brain perceives scratching as pain and shifts attention away from the itch.

• It releases endorphins that naturally suppress the sensation of itching.

What happens in the brain when a person learns a new skill or repeatedly experiences something?

• The brain creates new neurons to store the information.

• Existing neural connections become stronger and more numerous.

• The brain reorganizes its structure by eliminating old, unused pathways.

• The central nervous system temporarily shuts down to process the new information.