Question

define the following:

1. Stimulus

2. Receptor

3. Effector

4. Impulse

5. Synapse

6. Reflex arc​

Answer 1

Answer:

1.Stimulus: A stimulus is any agent or an environmental change which initiates a response in the body.

2.Receptor: It is a group of specialised epithelial cells in contact with the terminal endings of the nerve cells which respond to stimulus and convert it into an impulse in a sensory neuron.

3.Effector: It is a organ that responds to motor nerve impulse.

4.Impulse: A wave of irritability(electrical disturbance that sweeps over the nerve cell)

5.Synapse: It is the point of contact between the terminal branches of the axon of a neuron with the dendrites of another neuron separated by a fine gap.

6.Reflex arc: A reflex arc is the shortest route that can be taken by an impulse from a receptor to an effector.