Answer: Spinal cord.
Explanation:
The spinal cord of the central nervous system helps to move off quickly as a part of the reflex response. Jill stepped on a tack and suddenly he realizes that he should quickly move his legs out of the tack.
The pain is not stimulated until the signals reaches from the receptor to the brain. The formation of the reflex arc ensures that the amount of potential tissue damaged is less.
It forces the body to move quickly from the place that is causing damage.Example: Moving the leg up involuntarily when stepped on pin.
This occurs because the sensory neurons connects to the motor neurons within the spinal cord.This leads to the contraction of bones and muscles.
Hence, the correct option is spinal cord.
Experiments have shown that the first case is what happens<span>: the increase in nuclear charge overcomes the repulsion between the additional electrons in the valence level. Therefore, the </span>size<span> of </span>atoms<span> decreases as one moves </span>across<span> a </span>period<span> from left to right in the </span>periodic table<span>.</span>
Of course not! There's lots of ways materials can enter. It also depends on the cell; whether it has cell wall and cell membrane or only cell membrane.
Besides diffusion, there's also osmosis and active transport.
If the cell has only cell membrane, it means it's partially permeable, which means osmosis can happen.
*hope this helps :)
<span>The answer is scientific laws. Laws vary from scientific theories in that they do not postulate an explanation of occurrences: they are simply refinements of the outcomes of recurrent observation. As such, a law is partial in applicability to conditions like those previously experimental, and may be create false when inferred.</span>