Feature detection is a process by which the nervous system sorts or filters complex natural stimuli in order for it to extract behaviorally relevant cues that has been so high. one example is the external skeleton. an external skeleton, also known as the exoskeleton, this is an external covering that supports and protects the body of an animal.
Electron microscope.
An electron microscope has a larger zoom than a light microscope. Thus, an electron microscope will be able to see the internal structure of a nucleolus whereas a light microscope will not be able to.
The main signal in small intestine for pancreatic bicarbonate ion secretion is Secretin.
When food from the stomach with acidic medium enters duodenum(first part of small intestine) it stimulates the lining of duodenum cells to release the hormone secretin.
This hormone travels via bloodstream to pancreas and stimulate to it to release bicarbonate ions.Now these ions enter duodenum and neutralise the acidic medium.
This results in the optimum pH for the enzymatic action to take place thereby promoting final digestion of protein.