The term mechanical digestion refers to the physical breakdown of large pieces of food into smaller pieces which can subsequently be accessed by digestive enzymes. In chemical digestion, enzymes break down food into the small molecules the body can use.igestion begins in the mouth with the secretion of saliva and its digestive enzymes. Food is formed into a bolus by the mechanical mastication and swallowed into the esophagus from where it enters the stomach through the action of peristalsis.
The stigma is generally in the center of the flower and stands up on the style, taller than the surrounding anthers. It usually has a gelatinous or visceral appearance, which is slightly damp and furry.
Pistil. The pistil is the female part of a flower, consisting of the stigma, style, ovary and ovule. The stigma is the part of the flower that receives the pollen during fertilization. It sits on top of the pistil and is sticky in order to catch the pollen.The style is a tube that extends out the top of the ovary.istil. The pistil is the female part of a flower, consisting of the stigma, style, ovary and ovule. The stigma is the part of the flower that receives the pollen during fertilization. It sits on top of the pistil and is sticky in order to catch the pollen.