Exploring the Peripheral Nervous System

What happens to the brain when it's isolated from external information?

• It focuses on internal thoughts only.

• It starts to function more efficiently.

• It begins to confuse thoughts with real experiences.

• It shuts down temporarily.

Which type of sensory nerve receptor responds to changes in temperature?

• Mechanoreceptors

• Photoreceptors

• Thermoreceptors

• Chemoreceptors

What is the primary role of nociceptors in the nervous system?

• To detect light

• To sense temperature changes

• To indicate pain

• To respond to pressure

Why is pain considered a useful sensation?

• It has no real purpose.

• It is a sign of healthy nerve function.

• It signals potential harm or damage to the body.

• It indicates a state of relaxation.

What is the first step in the body's response to stepping on a tack?

• Motor neurons send a signal.

• Sensory receptors detect a change.

• A reflex action lifts the foot.

• The brain perceives pain.

What triggers the action potentials in nociceptors?

• A stimulus intense enough to cause a reaction

• A decrease in temperature

• Exposure to light

• A calming sensation

What is a reflex arc?

• A pathway for cognitive thought

• A learned response to stimuli

• A type of sensory receptor

• A neural pathway that mediates a reflex action

How does the body differentiate between innate and learned reflexes?

• By the speed of the response

• Through the type of stimuli

• By whether the brain is involved in the process

• Innate reflexes are automatic, while learned reflexes come from experience

When does the brain get involved in processing pain from stepping on a tack?

• After the motor neurons have responded

• Once the spinal cord sends signals to the brain

• Before the reflex action occurs

• Immediately after the foot lifts

What role does the thalamus play in pain perception?

• It is responsible for the reflex action.

• It secretes pain-relieving hormones.

• It acts as an information switchboard, directing the pain message.

• It directly perceives the pain.