Human Body Systems

Topics: Heart, Blood, Muscle Pages: 76 (3715 words) Published: February 14, 2015
Human Body Systems

Human Body Organization
The Human Body
is composed of

Organ Systems
are composed of

Organs
are composed of

Tissues
are composed of

Cells

DIGESTIVE SYSTEM is a
body system made up of
digestive tract and glands
responsible for digestion of
food.

Functions of
Digestive System:
 Digestion of food.
 Breaking down of chunks of food
into bits.
 Absorption of food nutrients.
 Excretion of undigested food.

PARTS OF DIGESTIVE SYSTEM.

Digestive Glands
 Salivary Gland – secrete saliva for lubrication
of food.
 Gastric Gland – secrete gastric juice for
lubrication of food and digestion of protein
and fats.
 Intestinal Gland – secrete intestinal juice for
breaking down of food molecules and
nutrients.
 Pancreas- secrete pancreatic juice for
digestion of fatty acids and glycerol.
 Liver – secrete bile (located in the gall
bladder) which emulsifies fat into fat
globules.

THE DIGESTIVE PROCESS
The digestive process starts in the MOUTH
where food is partly broken down by the
process of chewing and grinding by the help of
the chemical action of salivary enzymes. After
being chewed and swallowed, the food enters
the ESOPHAGUS, a long tube that runs food
from the mouth to the stomach through the
help of a wave-like muscle movement called
peristalsis. The STOMACH is a large, sack-like
organ that blends the food with a very strong
gastric acid. After being in the stomach, food
enters the SMALL INTESTINE, where bile
(produced in the liver and stored in the gall
bladder), pancreatic enzymes and other
digestive enzymes produced by the inner wall
of the small intestine which help in the
breaking down of food. After passing through
the small intestine, food passes into the LARGE
INTESTINE, where some of the water and
electrolytes (chemicals like sodium) are
removed from the food. Then, the undigested
food will be stored in the RECTUM until it is

FOUR STAGES OF DIGESTIVE
PROCESS
 Ingestion (the process of taking food and
drink into the body).
 Digestion (the breaking down of complex
nutrient molecules).
 Absorption (the movement of the digestion
products to bloodstream such as glucose and
amino acids).
 Egestion (the process of eliminating the
undigested food).

Interesting Facts…
• Food takes 3 days to complete its journey through the
digestive system.
• An adult digestive system is about 30 feet long.
• An average person takes in about 4.4 pounds of food and
drink every day, consuming over 110,000 pounds in a
lifetime.
• Gravity and bands of muscles help food travel down the
esophagus to the stomach, making it possible to eat lying
down or even upside down.
• The stomach is lined with a slimy mucus and releases an
acid called gastric juice to help dissolve food.
• Stomach noises are caused by food and air sloshing
around.
• Water makes up about 70% of the body.

RESPIRATORY SYSTEM is a
body system consist of different parts
responsible for breathing.

FUNCTIONS:
 Exchange of gases
 Oxidation of food molecule in
order to produce energy in the
form of ATP

LUNGS are the main organs of
the respiratory system. This is
where oxygen is taken into the
body and carbon dioxide is
breathed out.

PARTS OF RESPIRATORY
SYSTEM

TRACHEA is sometimes
called the windpipe. It
filters the air we breathe
and branches into the
bronchi.

PARTS OF RESPIRATORY
SYSTEM

BRONCHI are two air tubes
that branch off of the
trachea and carry air
directly into the lungs.

PARTS OF RESPIRATORY
SYSTEM

DIAPHRAGM is a dome-shaped main muscle
used in breathing at the bottom of the lungs.
When you breathe in, the diaphragm contracts.
When it contracts it enlarges the space that the
lungs
are in. This larger space pulls air into the
lungs. When you breathe out, the
diaphragm expands reducing the amount of
space for the lungs and forcing air out.

PARTS OF RESPIRATORY
SYSTEM...
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