Arco reflejo

The video tutorial explains reflex actions using the knee-jerk reflex as an example. It describes the simplest reflex arc, which consists of three neurons: a sensory neuron, an interneuron, and a motor neuron. The motor neuron triggers a muscle reaction without involving the brain, resulting in a faster response.

What happens to the leg when the knee is tapped?

• The leg bends backward.

• The leg remains still.

• The leg moves sideways.

• The leg shoots upwards.

How many neurons are involved in the simplest reflex arc?

• Four

• Five

• Three

• Two

Which neuron reacts to the initial stimulus in a reflex arc?

• Sensory neuron

• Interneuron

• Cerebral neuron

• Motor neuron

What is the function of the motor neuron in a reflex arc?

• To slow down the reaction

• To make a muscle react

• To connect sensory neurons

• To send signals to the brain

Why is the reaction in a reflex arc faster?

• It uses electrical signals.

• It involves more neurons.

• It bypasses the brain.

• It is controlled by the brain.