<span>Refractory period is the period after an initial stimulus when a neuron is not sensitive to another stimulus.</span><span>
During the relative refractory period of an action potential, a larger than normal stimulus is needed to cause another action potential. This is due to the fact that t</span>he voltage gated potassium ion channels remain open long enough to hyperpolarize the axon membrane.
At two points close together toward the upper right of the diagram, since X and Y chromosomes are more advanced.
Indigestion fiber, enteric bacteria, water
Explanation:
It sends message directly to muscles and glands
