What is the difference between a reflex action and walking?
What happens at the synapse between two neurons?
Which part of the brain maintains posture and equilibrium of the body?
How do we detect the smell of an agarbatti (incense stick)?
What is the role of the brain in reflex action?
Answers
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Answer :-
1. Reflex Action
- It is spontaneous immediate response to a stimulus.
- It happens without will of individual.
- It is controlled by spinal cord.
Walking
- It is a voluntary action
- It occurs with the will of individual
- It is controlled by spinal cord
2. At synapse the electrical signals are converted into chemicals that can easily cross over the gap and pass on to the next neuron where it again gets converted into electrical signals.
3. The part of the brain maintains posture and equilibrium of the body is cerebellum.
4. The olfactory receptors ; in the nose pick the smell and send this to the brain as a signal by this way we can detect the smell of an incense stick.
5. Reflex actions are sudden responses. It is involuntary action which does not involve thinking. For example, when we touch a hot object, we withdraw our hand immediately without thinking. The sensory nerves that detect the heat are connected to the nerves that move the muscles of the hand. Such a connection of detecting the signal from the nerves (input) and responding to it quickly (output) is known as reflex arc. Reflex arcs are formed in the spinal cord but the information is still sent to the brain. The brain doesn’t have a significant response to it.
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