How do livng things respond to stimuli?

Answer 1

There are two types of responses to stimuli. 1)Deep response which requires integration by the brain such as thinking. 2)Simple response which is done by reflex arc. The reflex Arc is consisted if receptor, sensory neuron, relay neuron, motor neuron and effector which is either muscle or gland.

For example in humans. If your hand touches a hot object.

Heat receptors in your hand will act as sensor, passing an impulse by generating action potential in the sensory neuron. The sensory neuron passes the impulse to along it till reaching the spinal cord passing the impulse to the relay neuron by a process called synapse. The relay neuron synapse with motor neuron to pass the impulse to it. The end of the motor neuron is connected to the bi-ceps muscle in the arm. As the impulse reaches the end of the motor neuron it passes impulse to the muscle ordering it to contract, thus the hand is removed away from stimulus. This process take a fraction of a second.

Answer 2

Living things responding to stimuli refers to them responding to something or an event that rouses a response from them. Some examples are:

A person putting on a coat in cold weather.

A person removing their hand quickly from a hot object.

A mother bear protecting her cubs from a predator.

A worm moving away when a person touches it.

A dog barking at a stranger

Answer 3

No, robots are not living and they have input sensors which can modify its motion or action.

Answer 4

because if someone or if a bug or animal had to bite you,you would say "ouch! and the message will go to your brain.