Page 6 - Digestive System

(2) Pharynx

It is a common cavity leads to the esophagus and trachea.

(3) Esophagus

It is a muscular tube that the Esophagus
food travels through from your
pharynx to your stomach. Liver

Stomach
(4) Stomach Gall bladder

A muscular sac works on Pancreas

mixing food up by its digestive Duodenum
juices. After a few hours food
changes into semi - liquid

substance, in where an incomplete digestion of protein

takes place by a gastric juice, then food travels to the small
intestine.
(5) Small intestine
Its length is about seven meters, it coils inside the abdominal
cavity. It starts with a part known as duodenum where the bile
juice (secreted by liver) and pancreatic juice (produced by
pancreas) are poured in. Duodenum is followed by a part of the
small intestine known as ileum. Intestinal juice is poured in the

ileum where the digestion to different types
of food is completed.

Activity (4):

Have a test tube contains an amount of
food oil then add some bird's bile juice to
it. Shake it well.

What do you observe?.................... Fatty Food oil
Conclusion ..................................... emulsion

Bile juice: helps to digest fats where it changes fats into a
fatty emulsion.

12 Science - Search & Learn 4 Grade Primary
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