Biology Nervous System

1- Search on the internet for a video showing an example of a reflex action.

2-Explain the term reflex action.

A reflex, or reflex action, is an involuntary and nearly instantaneous movement in response to a stimulus. A reflex is made possible by neural pathways called reflex arcs which can activate an impulse before that impulse reaches the brain. A reflex is not done under conscious control.

3- State the structures involved in the reflex arc.

The structures involved in the reflex arc are: receptor neuron, sensory neuron, relay neuron(spinal cord), motor neuron and effector(muscle).

4- Explain how the reflex action in your video takes place.

The reflex action in our video is called knee-jerk reflex, and it involves hitting someone with a small hammer slightly beneath the knee. The tendon below your kneecap contains stretchy receptor neurons are stimulated by the hit and send the information to the spinal cord through the sensory neurons. The relay neuron in the spinal cord transmits the information from the sensory neuron to the motor neuron, which sends the impulse to the quadriceps muscle. The quadricep is the effector which triggers muscle contraction that causes the leg to extend.

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