Because so much of the food now a days is very unhealthy and lacks the fiber it should contain.<span />
<span>It gathers information about, also responds to, changes in the environment. Receptors respond to a stimulus and send impulses along sensory neurons to the CNS(Central Nervous System).
Hope this helps!
Thanks,
-xxred24
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Receptors<span> are generally transmembrane </span>proteins<span>, which bind to signaling molecules outside the cell and subsequently transmit the signal through a sequence of molecular switches to internal signaling pathways</span>
It tells you the organism is moving to the top of the slide and going left
