Reflexes and Neuron Functionality

Dr. James Gill discusses reflexes, their features, and components, using the Incredible Hulk as a metaphor. He explains the reflex arc, motor neuron lesions, and how thyroid conditions affect reflexes. The video concludes with a simple reflex test to try at home.

Which of the following is NOT a feature of a reflex?

• It is rapid.

• It is voluntary.

• It involves an activator.

• It helps maintain homeostasis.

What is the role of the sensory fiber in a reflex?

• To transmit the message to the brain.

• To transmit the message to the spinal cord.

• To activate the muscle.

• To detect the stimulus.

In the Hulk example, what does Bruce Banner's transformation illustrate about reflexes?

• Reflexes do not involve the whole body.

• Reflexes can be triggered by stress or injury.

• Reflexes are slow and controlled.

• Reflexes are voluntary actions.

What is the primary function of the efferent neuron in a reflex arc?

• To carry the response signal to the muscle.

• To transmit the message to the brain.

• To integrate the sensory input.

• To detect the stimulus.

What happens to reflexes in an upper motor neuron lesion?

• Reflexes are decreased.

• Reflexes are increased.

• Reflexes remain unchanged.

• Reflexes are completely absent.

Which of the following is a characteristic of a lower motor neuron lesion?

• Increased muscle tone.

• Spasticity of muscles.

• Decreased reflexes.

• Brisk reflexes.

How does hypothyroidism affect reflexes?

• It causes reflexes to be absent.

• It causes brisk reflexes.

• It causes slow rising reflexes.

• It has no effect on reflexes.

What is the effect of hyperthyroidism on reflexes?

• Reflexes are brisk.

• Reflexes are slow.

• Reflexes are absent.

• Reflexes are unchanged.

Which cranial nerves are involved in the simple home reflex test using a torch?

• Cranial nerves IV and V.

• Cranial nerves III and IV.

• Cranial nerves II and III.

• Cranial nerves I and II.

What is the purpose of the home reflex test mentioned in the video?

• To test muscle strength.

• To test the eye's response to light.

• To test the body's response to heat.

• To test the knee reflex.