Hey!!
here is your answer >>>
Sensory nerves are present in the nervous system, these nerves sends the signal to the brain about hot,cold,etc.
hope my answer helps!
The answers are;
The muscular contractions are wave-like
The muscular contractions are entirely involuntary
This action is called peristalsis.
It is powered by the expansion and contraction of the smooth muscles present in the esophagus. It is controlled by the sympathetic activity of the autonomic nervous system hence
the movements are involuntary.
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>
The ATP molecule is used by cells as an energy source! I hope this helps!