about Digestion in Human role of tongue in digestion Salivary glands and saliva duodenium large intestine liver

2. ROLE OF TONGUE IN DIGESTION
Your tongue helps out, pushing the food
around while you chew with your teeth.
When you're ready to swallow, the
tongue pushes a tiny bit of mushed-up
food called a bolus (say: BO-luss)
toward the back of your throat and into
the opening of your esophagus, the
second part of the digestive tract.

4. SALIVARY GLANDS AND SALIVA
Salivary Glands and Saliva. Saliva is
produced in and secreted from salivary
glands. The basic secretory units
of salivary glands are clusters of cells
called an acini. These cells secrete a fluid
that contains water, electrolytes, mucus
and enzymes, all of which flow out of the
acinus into collecting ducts

8. GLOTTIS VS EPIGLOTTIS
Glottis is the opening into the windpipe,
which is responsible for the production of
sound. On the other hand, epiglottis is the
cartilaginous flap on top of the glottis, which
prevents the entering of food into the larynx.
The main difference between glottis and
epiglottis is the structure and the function

9. OESOPHAGUS
The oesophagus is a muscular tube. It
connects your mouth to your stomach. When
you swallow food, the walls of
the oesophagus squeeze together (contract).
This moves the food down
the oesophagus to the stomach. The upper
part of the oesophagus is behind the
windpipe (trachea)

11. PERISTALSIS
Peristalsis is a series of wave-like muscle
contractions that moves food to different
processing stations in the digestive tract. The
process of peristalsis begins in the
esophagus when a bolus of food is swallowed

13. ANTIPERISTALSIS

15. STOMACH
The stomach is a muscular organ located
on the left side of the upper abdomen.
The stomach receives food from the
esophagus. As food reaches the end of the
esophagus, it enters the stomach through
a muscular valve called the lower
esophageal sphincter.
The stomach secretes acid and enzymes
that digest food

17. SMALL INTESTINE
The small intestine or small bowel is an
organ in the gastrointestinal tract where most
of the end absorption of nutrients and
minerals from food takes place. It lies between
the stomach and large intestine, and receives
bile and pancreatic juice through the
pancreatic duct to aid in digestion

19. DUODENUM
The duodenum is the first part of the small
intestine. It is located between the stomach
and the middle part of the small intestine, or
jejunum. After foods mix with stomach acid,
they move into the duodenum, where they
mix with bile from the gallbladder and
digestive juices from the pancreas

21. LARGE INTESTINE
The large intestine, also known as the large
bowel, is the last part of the gastrointestinal
tract and of the digestive system in
vertebrates. Water is absorbed here and the
remaining waste material is stored as feces
before being removed by defecation

23. LIVER AND PANCREAS
The liver is the largest gland or chemical factory in the
body. It is like a sponge shaped like a wedge. It has
many metabolic and secretory functions. It produces a
digestive fluid called bile, which is important in
faciliating fat digestion and absorption.
LIVER
PANCREAS
The pancreas is a gland which releases digestive
enzymes and hormones. It has functions both in the
digestive system and the endocrine system.

24. PANCREASLIVER

25. ANUS AND EGESTION
Excretion is the removal of toxic materials,
waste products of metabolism and excess
substances from organisms. Egestion is the
passing out of undigested food as faeces,
through the anus. Three major organs of
excretion are the skin, kidneys and lungs

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