Insects like houseflies secrete digestive juices on the food. The food is digested while it is still to be ingested.

The major part of digestion takes place in the duodenum.

Pancreatic juice contains enzymes that convert fats into fatty acids and glycerol, plus sodium bicarbonate to neutralise stomach acid.

The chyme (food) exits the stomach via. pyloric sphincter or valve and passes into the duodenum; the first segment of the small intestine.

It always flows only in one direction from tissues to heart.

This happens in the mouth where salivary glands produce saliva that contains the enzyme amylase.

Exchange of materials between blood and cells occurs in the capillaries.

It protects cell membrane from any injury.

The major part of digestion takes place in the duodenum.

This function is carried out by plasma; another blood component.

Lipase digests fat into fatty acids and glycerol.

These are air-sacs at the end of bronchioles, and is the place where blood capillaries open. The exchange of gases in alveoli takes place due to pressure differential.

Transportation of food from photosynthetic parts of the plant to the non-green parts takes place through phloem and is known as translocation.

Platelets can release a variety of substances, most of which are involved in the coagulation or clotting of blood.

All of the above are absorbed. Thus, waste alone that is primarily in the form of urea enters into collecting tubules from various renal tubules.