Question

What is reflex action ? Explain with the help of a diagram.(Answer this question in your notebook, click the photo and upload here)
plz fast and plz insert hand drawn diagram if u can plz​

Answer 1

Explanation:

 reflex action is defined as a spontaneous, automatic and mechanical response to a stimuli without the will of an individual. In such actions there is no involvement of the brain. All reflex actions are conveyed through the spinal cord by a path called reflex arc.

The reflex action travels in the following sequence:

The reflex arc constitutes the following components:

A receptor to perceive the stimulus.

A sensory or afferent nerve which carries the message from the receptor to the spinal cord.

The neurons of spinal cord transmit the impulse from afferent neurons to efferent neurons.

The motor or efferent nerve carries messages from spinal cord to the muscles (effectors) that show the response.

Some examples of reflex actions are:

Blinking of eyes when a foreign particle gets in them.

Sneezing if an unwanted particle enters the nose.

Watering of mouth at the sight or smell of good food.

Withdrawal of foot while walking if a nail comes in the way and pricks the foot.

Immediate withdrawal of hand of a person if some hot thing touches it.

Answer 2

$\: \: \: \: \: \: \: \: \: \: \: \: \: { \mathtt{ \underline{ \underline{Reflex \: action}}}}$

"Reflex action is a sudden and involuntary response to stimuli. "

➸It helps organisms to quickly adapt to an adverse circumstance that could have the potential to cause bodily harm or even death.

➸Pulling our hands away immediately after touching a hot or cold object is a classic example of a reflex action.

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$\: \: \: \: \: \: \: \: \: { \mathtt{ \underline{ \underline{Parts \: of \: reflexes:-}}}}$

The five parts of most reflexes are:

• A sensor, which is a receptor that senses or detects a change.

• A sensory neuron (nerve cell) that carries the message from the sensor to the spinal cord.

• An interneuron, which is an in-between neuron, like a relay station between neurons.

• A motor neuron that carries the message from the spinal cord to the muscle.

• A muscle fiber that contracts.

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