Question

5. a. Describe the reflex arc.

b. Give the name of the three neurons involved

. c. What is the advantage to man in having the reflex arc.

d. When and how is the brain involved?

Answer 1

1. The reflex arc describes the pathway in which the nerve impulse is carried and the response is generated and shown by the effector organ. The receptor is present in the receptor organ.
2. There are three main types of neuron: sensory, motor, and relay.
3. It helps organisms to sense and respond immediately in dangerous situations, like fire, electrified wire, cautious walking on roads. The appetite or hunger is increased in getting the smell of food.
4. The purpose of reflex action is to provide quick response in situations where the organism does not have enough time to think. Reflex arcs are formed in the spinal cord, although the information inputs also reach the brain. This helps the brain to record this event and remember it for future use.